Raichu

Raichu was a member of the Outraging Charizard's in Total Pokémon Island and return for Pokémon Action and debuting in World Tour, before finally being selected again in Total Pokémon All-Stars.

Trivia
Raichu is the only Pokemon to both Rejoin and Debut into the game.
 * Raichu is also 1 of 2 Pokémon to debut into a season to have competed before.