The complete Pokemon RBY pokedex, part 1

Pokémon Name: Caterpie
Type: Bug
Classification: Worm Pokemon
Pokédex Number: 010
Ability: Shield Dust – User isn't affected by any secondary effects from pponent's damaging moves
Dream World ability: Run Away – Always successful at running away from wild Pokemon
Useful Attacks: It has useful attacks?
Location Found:
Diamond/Pearl: Route 204 (South) with FireRed inserted
Platinum: Route 204 (South) and Eterna Forest with FireRed inserted
HG: Routes 2, 30 and 31, Ilex Forest, National Park, Viridian Forest and via Headbutting trees
SS: National Park Bug-Catching Contest (Tuesdays, Thursdays and Saturdays only)
White: Breed Metapod or Butterfree
Black: Trade, Poke Transfer

The first season of the cartoon focused quite a bit on Ash's Caterpie/Metapod/Butterfree, and such attention made this trio of buggy Pokemon fairly popular. Us, we're over 'em. Too much Poke-swapping to make it evolve into a fairly "meh" final stage. Stare in wonder at its power!

Evolution: To Metapod at 7