Ash befriended Arceus after returning the Jewel of Life and saving it from death due to Marcus' arrogant and selfish attempts to destroy it.
Cloned from the Mythical Pokémon, Mew.
Mythical Pokémon said to be one of the most powerful.
Ash encountered Lugia when the Legendary Birds were attacking each other as the world began to fall apart, thanks to Lawrence III's attempts to capture them.
Ash befriended Lucario after releasing him from Sir Aaron's staff due to having the same Aura as his master.
Ash's first encountered Ho-Oh when he began their Pokémon journey with Pikachu.
Ash encounted Zekrom when he and Serena first arrived in Unova. Ability: Teravolt.