You can't catch it in the wild. You'll need to evolve it from Weepinbell with a Leaf Stone.
with a leafstone
at the safari
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You get a diploma and a gold trainer card.
How to get thunder wave on pokemon gold you can go in dragons den and there you can catch draniti who already knows thunderwave
You have to catch a Bellsprout or a Weepinbell (Evolves from Bellsprout). Then you can use a Leaf Stone on the Weepinbell and it will become a Victreebel.
with a leafstone
Victreebel is a leaf Pokemon, and its type is Grass-Poison.
u have to fight a team dim sun goon 1 of them has it along with another Pokemon
Catch a Bellsprout and train it. It will evolve into Weepinbell and then into Victreebel.
Go north of cerulean city go into the grass catch a bellsprout level up to lets say 25 then it will become a weepingbel by the way use a leaf stone to evolve it to victreebel.
Victreebel
Victreebel is #71 in the national pokedex, and it is a Grass-Poison type Pokemon.
You have to use a leaf stone to evolve weepinbell into victreebel.
You can catch it in Route 2.
You can't catch Arceus. You can only catch Arceus in Pokemon Platinum.
You can catch Slowpoke in Pokemon Gold in the Slowpoke Well that is by Azalea Town and you can also find them in Tohjo Falls.