Mew

Mew was a member of the Screeching Zubat's in Total Pokémon Island. She would later return for Action, World Tour, and finally All-Stars, where she would actually win the season.Mew is one of Ten Pokémon to make the merge at-least 3 Times.
 * Those Nine others, are Gardevoir, Absol, Jirachi, Braixen, Zoroark, Lucario, Victini, Slyveon, Raichu
 * Coincidentally, everyone except Raichu, made the merge in Island.