The complete Pokemon GSC pokedex, part 2

Pokémon Name: Cleffa
Type: Normal
Classification: Star Shape Pokemon
Pokédex Number: 173
Ability: Cute Charm and Magic Guard
Dream World ability: Friend Guard
Useful Attacks: Sing
Location Found:
D/P/P: Trophy Garden, Mt. Coronet
HG/SS: Breed Clefairy or Clefable
B/W: Breef Clefairy or Clefable

The first form of Clefairy and Clefable. Once it's happy enough, it'll evolve onto its more powerful stages.

Evolution: To Clefairy via Happiness