Arceus was introduced in Generation IV with Pokemon Diamond and Pearl, released in 2006 in Japan, as the mythical Alpha Pokemon credited in Sinnoh lore with shaping the universe. Like every Pokemon in the main games, it has a short synthesized cry played when it appears in battle or is viewed in the Pokedex. Fans ripped and shared that cry online, and it spread through battle videos, fan games and soundboards. Its godlike role in the lore is why creators still reach for this one cry over hundreds of others.