Totodile, Pikachu, Chikorita, Cyndaquil, Noctowl, and Bulbasaur are Ash's six main Pokemon. Johto Journeys is the first season set in Johto, so the show had to give way to new heroes. While Ash sends his Heracross to Professor Oak's lab so Oak can study it, he is reunited with Heracross in Master Quest.