You can't. You have to evolve sneasel.
There is no weavile. The pokedex cannot accept that poke. Any way, weavile is in diamond or pearl or platinum.....
catch one near snow-point city or evolve sneasel
You can't catch a Weavile in HeartGold and SoulSilver but you can catch a Sneasel in Mt. Silver or within Route 28 and give it a Razor Claw and level it up at night and it'll end up evolving into a Weavile.
In the Almia Castle.
Go down from the room where you catch lucario and you will find to weavile
get a sneasel from snowpoint city and get the razor claw and you get that from victory road then lv it up 1 lv and it should be a weavile.
He has a weavile, gyarados, honchkrow, and a crobat in Diamond and Pearl. In the Distortion World, he has a weavile, houndoom, gyarados, crobat and a honchkrow, not necessarily in that order.
Go to Snowpoint city and on your way there are sneasels. Just have your sneasel evolve to a weavile.
NO you cant catch syther in Pokemon pearl
You can't catch a charizard in pokemon pearl.
No, you cannot catch Cyndaquil in Pokémon Pearl.
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond