Ash's Krookodile

Sunglasses Krokorok was a Pokémon that recurred for several episodes in the anime. It used to be a Sandile in BW003 and BW012 until it evolved into Krokorok in BW020 while battling Ash's Pikachu until it blasted off into the sky after getting defeated in both BW012 and BW020. It is set to reappear in BW023. Ash will catch it in a later episode according to the "Seven-Colored Arch" ending that started in BW063

Trivia

 * He is the first Pokémon to evolve in black and white saga.
 * He was set to reappear in BW023 but the episode along with BW024 has been postponed until further notice. However, seeing as Ash will catch Krokorok, the plasma episodes seem to be cancelled permantly.
 * The Sunglasses Krokorok has seemed to have inherited the blast off gag from Team Rocket, until Ash catches it.