Pokémon Name: Butterfree
Type: Bug/Flying
Classification: Butterfly Pokemon
Pokédex Number: 012
Ability: Compound Eyes
Location Found: Evolve Metapod to level 10
Useful Attacks: Sleep Powder

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 buffer, 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

Level              Attack                        Type
10                    Confusion                  Psychic
12                    Poison Powder          Poison
12                    Stun Spore                 Grass
12                    Sleep Powder            Grass
16                    Gust                          Flying
18                    Supersonic                Normal
22                    Whirlwind                 Normal
24                    Psybeam                   Psychic
28                    Silver Wind                 Bug
30                    Tailwind                    Flying
34                    Safeguard                 Normal
36                    Captivate                  Normal
40                    Bug Buzz                    Bug