Rare Pokemon

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.