Originally Posted by Pe2k Voices
That and what makes the Pokemon evolve is the radiation emitted from the transfer machines... *adjusts glasses I don't have*, nerd moment... Srry...
You're right! When Dawn and Ash traded Buizel for Aipom, They used a transfer machine. So he gave Haunter to her, not traded her. And Haunter wasn't even captured if I recall, but I don't remember.