At the start of the show, you see all of Ash, Misty, and Brock's Pokémon are released. Note that there are only one of each type. (One Squirtle, one Psyduck, one Onix, etc.) When "Vacation" (Vitamin C) ends, all the Pokémon run by. After Pikachu is spun around by Onix, Psyduck runs on Pikachu to join the others. In the next shot, Bulbasaur, Squirtle, and Togepi are shown. But wait...what? Psyduck is there too!!!