The complete Pokemon GSC pokedex, part 3

Pokémon Name: Igglybuff
Type: Normal
Classification: Balloon Pokemon
Pokédex Number: 174
Ability: Cute Charm
Dream World ability: Friend Guard
Useful Attacks: Sing
Location Found:
D/P/P: Trophy Garden
D/P/P/HG/SS: Breed Jigglypuff or Wigglytuff
B/W: Breed Jigglypuff or Wigglytuff

Another pre-evolution that needs to move along to become truly useful in combat. Once it's happy enough, it'll become Jigglypuff.

Evolution: To Jigglypuff via Happiness