Pokémon Ultra Sun and Ultra Moon feature over 400 Pokémon, many of which aren’t in the originals

More than 400 Pokémon will be discoverable in Pokémon Ultra Sun and Pokémon Ultra Moon, many of which were not available in Pokémon Sun and Pokémon Moon. Some of these Pokémon will only appear depending on which version of the game is played. For example, in the same patch of tall grass where Houndoom will appear in Pokémon Ultra Sun, Manectric will appear in Pokémon Ultra Moon.