The complete Pokemon RBY pokedex, part 2

Pokémon Name: Butterfree
Type: Bug/Flying
Classification: Butterfly Pokemon
Pokédex Number: 012
Ability: Compoundeyes – Boosts user's accuracy by 30%; doubles chances that wild Pokemon will be holding an item if user is in front of party
Dream World ability: Tinted Lens – doubles the effectiveness of "not very effective" moves
Useful Attacks: Sleep Powder
Location Found:
D/P/P: Evolve Metapod to level 10
HG: Route 2, Viridian Forest, Headbutt trees, National Park Bug-Catching Contest (Tuesdays, Thursdays and Saturdays only)
SS: National Park Bug-Catching Contest (Tuesdays, Thursdays and Saturdays only)
White: Route 12 (shaking patches)
Black: Trade, Poke Transfer

We've said some harsh words about Butterfree's longevity, but you can't deny its usefulness early in the game. As a fast-evolving Pokemon, you can get access to some reliable moves by pushing Metapod to level 10 - Stun Spore and Sleep Powder, for example, are quite handy in the initial outset. Heck, they're useful pretty much up until the end of the game, though by that point you'll have better, more varied Pokemon to consider. Still, as a Pokemon who learns moves from six different types, Butterfree has its moments.

Evolution: From Metapod at 10