There are six extremely helpful Pokemon trainers in Gold/Silver whose telephone numbers you should definitely keep in your Pokegear. These six will randomly give you tips on how to find rare Pokemon and steer you towards areas where certain Pokemon are currently "swarming."

 

• Fisherman Ralph (Route 32): Helps you find Qwilfish
• Hiker Anthony (Route 33): Helps you find Dunsparce
• Bug Catcher Arnie (Route 35): Helps you find Yanma
• Schoolboy Chad (Route 38): Helps you find Snubbull
• Fisherman Wilton (Route 44): Helps you find Remoraid
• Hiker Parry (Route 45): Helps you find Marill

Gold Version: The following Pokemon are not available in Pokemon Gold and have to be traded from Silver, Red, Blue or Yellow:

 

• Bulbasaur, Ivysaur and Venusaur
• Squirtle, Wartortle and Blastoise
• Charmander, Charmeleon and Charizard
• Kabuto and Kabutops
• Omanyte and Omastar
• Vulpix and Ninetales
• Meowth and Persian
• Phanpy and Donphan
• Ledyba and Ledian
• Skarmory
• Delibird
• Articuno
• Zapdos
• Moltres
• Mewtwo
• Mew

Silver Version: The following Pokemon are not available in Pokemon Silver and have to be traded from Gold, Red, Blue or Yellow:

 

• Bulbasaur, Ivysaur and Venusaur
• Squirtle, Wartortle and Blastoise
• Charmander, Charmeleon and Charizard
• Kabuto and Kabutops
• Omanyte and Omastar
• Mankey and Primeape
• Growlithe and Arcanine
• Teddiursa and Ursaring
• Spinarak and Ariados
• Gligar
• Mantine
• Articuno
• Zapdos
• Moltres
• Mewtwo
• Mew

There are a couple of Pokemon that only evolve when traded with another trainer. Some trade evolutions also require that the Pokemon holds a certain item when traded. Here's the list:

 

• Kadabra - Alakazam
• Graveler - Golem
• Haunter - Gengar
• Machoke - Machamp
• Poliwhirl - Politoed (hold King's Rock)
• Onix - Steelix (hold Metal Coat)
• Scyther - Scizor (hold Metal Coat)
• Porygon - Porygon2 (hold Up-Grade)
• Slowpoke - Slowking (hold King's Rock)
• Seadra - Kingdra (hold Dragon Scale)

The ruins of Alph are home to the mysterious Unown (#201), the only Pokemon that exists in more than one shape. Solving the different sliding-tile puzzles will drop you into the ruins below, where you can capture the mysterious Pokemon. In the beginning, you can only access one puzzle (the solution is Kabutop). You can get to the rest of the ruins once you have Surf and Strength. Surf lets you swim to the south cave which contains a puzzle of Aerodactyl. The other two puzzles are reached through the Union Cave using Surf and Strength. The puzzle to the southwest is an Omanyte, while the one to the west is a picture of Ho-oh.

The more puzzles you solve, the more varieties of Unown will be available to be caught. (There are 26 variations in all, one for each letter of the English alphabet. Ruins of ALPH, get it?). Once you have caught at least three different shapes of Unown, go to the Alph Lab just outside the first entrance. You will receive an upgrade to your Pokedex that lets you view and collect the different shapes of Unown. 

After you have caught all 26 shapes of Unown, you should return to the lab. Using the machine in the corner, you will now be able to use the Unown shapes to create and print out banners using the "Unown font" (if you have a GB Printer).

At the Daycare Center south of Goldenrod City on Route 33, you can give a male Pokemon and a female Pokemon to the keepers to breed new Pokemon.

Breed two Pikachus to get Pichu.
Breed two Electabuzzes and you get Elekid.
Breed two Clefairies and you get Cleffa.
Breed two Jigglypuffs and you get Igglybuff.
Breed two Magmars and you get Magby.
Breed a Venonat with a Pinsir to get Pinsir.
Breed a Hitmonchan or Hitmonlee with a Ditto to get Tyrogue.
Breed a Clefairy with a Snubbull to get another Snubbul.
Breed a Gyarados with the Red Gyarados to get a golden Magikarp.
 

Replace any of the Pokemon with the genderless Ditto if you've only got one of a kind. Ditto will act as a wildcard Pokemon.

 

Having trouble finding those really rare Pokemon in Gold/Silver? No problem, IGN's here to help:

 

• Ho-oh -- There is only one Ho-oh in Gold and Silver, so make sure you catch it. You can find it on top of the Tin Tower, but you'll need the Rainbow Wing to go up there. You get the Rainbow Wing from the Radio Station Manager in Goldenrod City (Gold version) or the old man in Pewter City (Silver version).
• Lugia -- You can find Lugia in Whirl Island, off Route 41. You'll need to know the HM 06 Whirpool technique to get in as well as the Silver Wing. You can find the latter in Pewter City (Gold) or the Radio Station in Goldenrod City (Silver).
• Chikorita, Totodile, Cyndaquil -- These are the three starting Pokemon in Gold/Silver. You have to pick one of the three -- if you want the others, you'll have to trade with a friend.
• Entei, Suicune, Raiko -- Dogs, cats, what are they? Who cares! They're cool and they're exceedingly rare. To catch these guys, go to the Burned Tower in Ecruteak City. When you get close to them, they will run away. After this brief encounter, these fast creatures will roam around Johto. So where do you find them? Check your Pokedex and have some Fast Balls ready.
• Togepi -- Professor Elm's assistant will give you an egg in Violet City after you beat the Gym Leader there. It will hatch into Togepi.
• Tyrogue -- You can get this young Fighting Pokemon from Blackbelt Kyo (if you have an empty slot in your party) in Mt. Mortar, or simply breed one using Hitmonchan or Hitmonlee and a Ditto.
• Sudowoodo -- This odd Rock type blocks your way on Route 36 (just like Snorlax). Use the Squirtbottle from Goldenrod City to battle it.
• Porygon -- You can get Porygon for 9,999 coins in the Celadon City Game Corner.
• Snorlax -- Snorlax is blocking the way into Diglett's Cave. Use the Poke Flute to wake it up.
• Eevee -- Apart from winning an Eevee in Pokemon Stadium or the Celadon City Game Corner, you can also get one at Bill's House.
• Aerodactyl -- There is only one Aerodactyl in Gold/Silver, but it's not that hard to get. Catch a Chansey and trade with the girl on Route 14 to get it.

Note: Use this code at your own risk. It may corrupt your save data if done incorrectly.

Go to a PC, and save. Attach the item you want to duplicate to the Pokemon you want to clone. Deposit it into the PC. Change boxes. When the screen is saying "Saving the game..." Turn off your GB. Turn it back on. You should have the deposited Pokemon in the PC, and a clone of it in your lineup. The item will either be on both monsters, or in your Backpack. Note: while doing this code, DO NOT withdraw any Pokemon. When the GB is turned back on, you'll find that the withdrawn Pokemon has been deleted. Note: You can duplicate up to 5 items/Pokemon at a time.

Still having problems completing your Pokedex? Below, you will find a locations table listing each and every Pokemon in Pokemon Gold and Silver. With some of the more common Pokemon, the locations field will only list places where the Pokemon is most common.

 

No.	Pokémon	Locations
#001	Bulbasaur	-
#002	Ivysaur	-
#003	Venusaur	-
#004	Charmander	-
#005	Charmeleon	-
#006	Charizard	-
#007	Squirtle	-
#008	Wartortle	-
#009	Blastoise	-
#010	Caterpie	G: Routes 2, 30, Ilex Forest, others S: National Park (Bug Catching Contest)
#011	Metapod	G: Routes 2, 30, Ilex Forest, others S: National Park (Bug Catching Contest)
#012	Butterfree	G: Routes 2, others S: National Park (Bug Catching Contest)
#013	Weedle	G: National Park (Bug Catching Contest) S: Routes 2, 30, Ilex Forest, others
#014	Kakuna	G: National Park (Bug Catching Contest) S: Routes 2, 30, Ilex Forest, others
#015	Beedrill	G: National Park (Bug Catching Contest) S: Routes 2, others
#016	Pidgey	Routes 1, 29, 30, others
#017	Pidgeotto	Routes 8, 15, 43, others
#018	Pidgeot	Evolve from Pidgeotto only
#019	Rattata	Routes 1, 22, 29, 30, 31, 32, 33, Union Cave, Sprout Tower, others
#020	Raticate	Burned Tower, Routes 7, 27, Union Cave, others
#021	Spearow	Routes 22, 33, 42, others
#022	Fearow	Routes 16, 17, 18, others
#023	Ekans	G: Goldenrod City Game Corner S: Routes 3, 32, 33, others
#024	Arbok	G: Evolve from Ekans only S: Routes 3, 4, 27, others
#025	Pikachu	Route 2
#026	Raichu	Evolve from Pikachu only
#027	Sandshrew	G: Union Cave, Mt. Moon S: Goldenrod City Game Corner
#028	Sandslash	G: Routes 26, 27, Mt. Moon S: Evolve from Sandshrew only
#029	Nidoran Female	Routes 35, 36
#030	Nidorina	Routes 13, 14, 15
#031	Nidoqueen	Evolve from Nidorina only
#032	Nidoran Male	Routes 35, 36
#033	Nidorino	Routes 13, 14, 15
#034	Nidoking	Evolve from Nidorino
#035	Clefairy	Mt. Moon
#036	Clefable	Evolve from Clefairy
#037	Vulpix	G: - S: Routes 7, 8, 36, 37, others
#038	Ninetales	Evolve from Vulpix
#039	Jigglypuff	Routes 3, 4
#040	Wigglytuff	Evolve from Jigglypuff
#041	Zubat	Routes 32, 33, Union Cave, Slowpoke Well, Ilex Forest, others
#042	Golbat	Slowpoke Well, Victory Road, others
#043	Oddish	Routes 5, 6, Ilex Forest, others
#044	Gloom	Route 5
#045	Vileplume	Evolve from Gloom
#046	Paras	Ilex Forest, National Park
#047	Parasect	Evolve from Paras
#048	Venonat	Routes 24, 25, 32, National Park, others
#049	Venomoth	Routes 24, 25, National Park, others
#050	Diglett	Diglett's Cave
#051	Dugtrio	Diglett's Cave
#052	Meowth	G: - s: Routes 5, 8, 39, others
#053	Persian	G: - S: Route 7
#054	Psyduck	Routes 6, 35, Ilex Forest
#055	Golduck	Routes 6, 35, Ilex Forest, others
#056	Mankey	G: Routes 9, 42 S: -
#057	Primeape	G: Route 9 S: -
#058	Growlithe	G: Routes 7, 36, 37, others S: -
#059	Arcanine	Evolve from Growlithe
#060	Poliwag	Routes 22, 30, Ecruteak City, others
#061	Poliwhirl	Route 30, Violet City, Mt. Silver, others
#062	Poliwrath	Evolve from Poliwhirl
#063	Abra	Routes 5, 24, 34, Goldenrod City, others
#064	Kadabra	Route 8
#065	Alakazam	Evolve from Kadabra
#066	Machop	Mt.Mortar, Rock Tunnel, Goldenrod City
#067	Machoke	Mt.Mortar, Rock Tunnel
#068	Machamp	Evolve from Machoke
#069	Bellsprout	Routes 5, 24, 31, 32, others
#070	Weepinbell	Routes 24, 25, 44, others
#071	Victreebel	Evolve from Weepinbell
#072	Tentacool	Routes 12, 34, New Bark Town, others
#073	Tentacruel	Routes 12, 34, New Bark Town, others
#074	Geodude	Route 46, Dark Cave, Mt. Mortar, others
#075	Graveler	Route 45, Dark Cave, Mt Silver, others
#076	Golem	Evolve from Graveler
#077	Ponyta	Routes 26, 28, Mt. Silver, others
#078	Rapidash	Route 28, Mt. Silver, Pewter City
#079	Slowpoke	Slowpoke Well, others
#080	Slowbro	Slowpoke Well
#081	Magnemite	Routes 6, 11, 38, others
#082	Magneton	Evolve from Magnemite
#083	Farfetch'd	Routes 38, 39
#084	Doduo	Routes 22, 26, 27, others
#085	Dodrio	Routes 26, 28, Mt. Silver, others
#086	Seel	Whirl Island Caves
#087	Dewgong	Evolve from Seel
#088	Grimer	Routes 16, 17, 18, others
#089	Muk	Routes 16, 17, 18, others
#090	Shellder	Routes 20, 26, Vermilion City (fish)
#091	Cloyster	Evolve from Shellder
#092	Gastly	Tin Tower, Sprout Tower
#093	Haunter	Route 8
#094	Gengar	Evolve from Haunter
#095	Onix	Violet City, Union Cave, Victory Road
#096	Drowzee	Routes 11, 34, 35
#097	Hypno	Route 11
#098	Krabby	Route 19, Whirl Island Cave, Cherrygrove City, others
#099	Kingler	Routes 19, 40, Cherrygrove City, others
#100	Voltorb	Route 10, Olivine City, Mahogany Town (Rocket Hideout)
#101	Electrode	Mahogany Town (Rocket Hideout)
#102	Exeggcute	Forest Locations: Trees (use Headbutt)
#103	Exeggutor	Evolve from Exeggcute
#104	Cubone	Rock Tunnel
#105	Marowak	Rock Tunnel
#106	Hitmonlee	Evolve from Tyrogue (SPC)
#107	Hitmonchan	Evolve from Tyrogue (SPC)
#108	Lickitung	Route 44
#109	Koffing	Burned Tower
#110	Weezing	Evolve from Koffing
#111	Rhyhorn	Victory Road
#112	Rhydon	Blackthorn City
#113	Chansey	Routes 13, 14, 15
#114	Tangela	Routes 21, 44, Mt. Silver, others
#115	Kangaskhan	Rock Tunnel
#116	Horsea	Whirl Island Caves
#117	Seadra	Whirl Island Caves
#118	Goldeen	Routes 4, 25, Mt. Mortar, others
#119	Seaking	Routes 4, 25, Mt. Mortar, others
#120	Staryu	Routes 19, 34, Olivine City, others
#121	Starmie	Evolve from Staryu
#122	Mr. Mime	Route 21
#123	Scyther	National Park (Bug Catching Contest)
#124	Jynx	Ice Path
#125	Electabuzz	Route 10
#126	Magmar	Burned Tower
#127	Pinsir	National Park (Bug Catching Contest)
#128	Tauros	Routes 38, 39
#129	Magikarp	Route 43, Lake of Rage, Blackthorn City, others
#130	Gyarados	Lake of Rage, Fuchsia City
#131	Lapras	Union Cave (Fridays)
#132	Ditto	Routes 34, 35
#133	Eevee	Goldenrod City, Celadon City
#134	Vaporeon	Evolve from Eevee
#135	Jolteon	Evolve from Eevee
#136	Flareon	Evolve from Eevee
#137	Porygon	Goldenrod City Game Corner
#138	Omanyte	-
#139	Omastar	-
#140	Kabuto	-
#141	Kabutops	-
#142	Aerodactyl	Route 14 (trade)
#143	Snorlax	Vermilion City (wake with Radio's Flute)
#144	Articuno	-
#145	Zapdos	-
#146	Moltres	-
#147	Dratini	Route 45, Goldenrod City, Dragon's Den
#148	Dragonair	Route 45, Dragon's Den
#149	Dragonite	Evolve from Dragonair
#150	Mewtwo	-
#151	Mew	- (Prize in Nintendo Events, Contests, Mall Tours)
#152	Chikorita	New Bark Town (starting Pokemon)
#153	Bayleef	Evolve from Chikorita
#154	Meganium	Evolve from  Bayleef
#155	Cyndaquil	New Bark Town (starting Pokemon)
#156	Quilava	Evolve from Cyndaquil
#157	Typhlosion	Evolve from Quilava
#158	Tododile	New Bark Town (starting Pokemon)
#159	Croconaw	Evolve from Tododile
#160	Feraligtr	Evolve from Croconaw
#161	Sentret	Routes 1, 29
#162	Furret	Route 1
#163	Hoothoot	Routes 1, 29, 30, 31, 35, 36, 37, National Park, others
#164	Noctowl	Routes 2, 14, 43, others
#165	Ledyba	G: - S: Routes 2, 30, 37, others
#166	Ledian	G: - S: Routes 2
#167	Spinarak	G: Routes 2, 30, 37, others S: -
#168	Ariados	G: Route 2 S: -
#169	Crobat	Evolve from Golbat (FRN)
#170	Chinchou	Fish: Routes 20, 41, New Bark Town, others
#171	Lanturn	Fish: Routes 20, 41, New Bark Town, others
#172	Pichu	Breed at Daycare Center
#173	Cleffa	Breed at Daycare Center
#174	Igglybuff	Breed at Daycare Center
#175	Togepi	Violet City  (receive from Prof's aide)
#176	Togetic	Evolve from Togepi (FRN)
#177	Natu	Ruins of Alph
#178	Xatu	Evolve from Natu
#179	Mareep	Routes 32, 42, 43, others
#180	Flaafy	Routes 42, 43, others
#181	Ampharos	Evolve from Flaafy
#182	Bellossom	Evolve from Gloom (STN)
#183	Marill	Mt. Mortar
#184	Azumarill	Evolve from Marill
#185	Sudowoodo	Route 36 (use Squirtbottle)
#186	Politoed	Evolve from Poliwhirl (STN)
#187	Hoppip	Routes 13, 32, 33, others
#188	Skiploom	Route 14
#189	Jumpluff	Evolve from Skiploom
#190	Aipom	Mountain Locations: Trees (use Headbutt)
#191	Sunkern	Route 24, National Park
#192	Sunflora	Evolve from Sunkern (STN)
#193	Yanma	Route 35
#194	Wooper	Route 32, Ruins of Alph, Union Cave
#195	Quagsire	Route 10, 27, 32, others
#196	Espeon	Evolve from Eevee (SPC)
#197	Umbreon	Evolve from Eevee (SPC)
#198	Murkrow	Routes 7, 16
#199	Slowking	Evolve from Slowpoke (STN)
#200	Misdreavus	Mt. Silver Caves
#201	Unown	Ruins of Alph
#202	Wobbuffet	Dark Cave
#203	Girafarig	Route 43
#204	Pineco	Forest Locations: Trees (use Headbutt)
#205	Forretress	Evolve from Pineco
#206	Dunsparce	Dark Cave
#207	Gligar	G: Route 45 S: -
#208	Steelix	Evolve from Onix (ITR)
#209	Snubbull	Route 38
#210	Granbull	Evolve from Snubbull
#211	Qwilfish	Fish: Routes 12, 13, 32
#212	Scizor	Evolve from Scyther (ITR)
#213	Shuckle	Cianwood City
#214	Heracross	Mountain Locations: Trees (use Headbutt)
#215	Sneasel	Route 28, Mt. Silver
#216	Teddiursa	G: - S: Route 45
#217	Ursaring	G: - S: Route 28, Victory Road, Mt. Silver Caves, others
#218	Slugma	Routes 16, 17, 18
#219	Magcargo	Evolve from Slugma
#220	Swinub	Ice Path
#221	Piloswine	Evolve from Swinub
#222	Corsola	Fish: Routes 18, 34, Olivine City, others
#223	Remoraid	Fish: Route 44
#224	Octillery	Evolve from Remoraid
#225	Delibird	G: - S: Ice Path
#226	Mantine	G: Route 41 S: -
#227	Skarmory	G: - S: Route 45
#228	Houndour	Route 7
#229	Houndoom	Evolve from Houndour
#230	Kingdra	Evolve from Seadra (ITR)
#231	Phanpy	G: Route 45 S: -
#232	Donphan	G: Route 28, Victory Road, Mt. Silver Caves, others S: -
#233	Porygon2	Evolve from Porygon (ITR)
#234	Stantler	Routes 36, 37
#235	Smeargle	Ruins of Alph
#236	Tyrogue	Mt. Mortar
#237	Hitmontop	Evolve from Tyrogue (SPC)
#238	Smoochum	Breed at Daycare Center
#239	Elekid	Breed at Daycare Center
#240	Magby	Breed at Daycare Center
#241	Miltank	Routes 38, 39
#242	Blissey	Evolve from Chansey (FRN)
#243	Raikou	Anywhere in Johto (after visit to Burned Tower)
#244	Entei	Anywhere in Johto (after visit to Burned Tower)
#245	Suicune	Anywhere in Johto (after visit to Burned Tower)
#246	Larvitar	Mt. Silver Caves
#247	Pupitar	Evolve from Larvitar
#248	Tyranitar	Evolve from Pupitar
#249	Lugia	Whirl Island Caves
#250	Ho-oh	Tin Tower
#251	Celebi	- (Prize in Nintendo Events, Contests, Mall Tours)

 

While the credits are being displayed you can hold the B button to make them go faster.

After you beat the Pokemon League, go to Viridian City and talk to a man near the Poke Mart. If you have all the badges, he will give you the Silver Wing. Then go to Cianwood City and surf to the Whirl Islands. Explore the cave thoroughly and you will find Lugia (L40).

If you go to the top of the National Park area in Johto, there is a section of fence above and to the right of the boy holding the GameBoy. Go straight through the small section and you can retrieve two item balls on the outer perimeter of the park.