You can catch it in the pokewalker, routes: Resort and Night Sky's Edge
They can also be found in Kanto's Mount Moon, and the Safari zone.
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In Mt.moon, but be patient, they are not common
Breed a Clefairy with a Jigglypuff.
You can't catch Skitty in Pokémon HeartGold or Pokémon SoulSilver but you can catch it in the Hoenn Field in the PokéWalker device and then transfer it over into HeartGold or SoulSilver.poke walker .
You can't catch a Clefable, since you have to use the Moon Stone of Clefairy to get it, but you can do that, or Catch it with a Ruby etc. game in.
It will evolve jigglypuff into wigglytuff, clefairy into clafable, nidorina into nidoqueen, and nidorino into nidoking.