Type:Bug
Catch:Catchable in all three versions.
Here's the move list
One of the Bug-type Pokémon, Caterpie will
     evolve into Metapod and Butterfree. These
     Pokémon are rare in the Red version and
     reside in both versions of the game.

     TYPE: Bug
     HEIGHT: .3 m
     WEIGHT: 2.9 kg
     EVOLUTION: Caterpie-Metapod-Butterfree
Level        Attack        Type

---            TACKLE       NRM
---            STRING SHOT    BUG