There are just over a hundred additions to the Alolan Pokédex for Ultra Sun and Moon compared to regular Sun and Moon. Pokémon Ultra Sun and Ultra Moon Pokédex additions Here on this page we'll list all of the newly added Pokémon for Ultra Sun and Ultra Moon - meaning the brand new Pokémon that have never been seen before, the new forms for already-available Pokémon, and all Pokémon that have been added to the Alolan Pokédex that could previously only be obtained through transfer from another generation.
New Pokémon Ultra Sun and Ultra Moon Pokémon are dotted throughout the game, with Ultra Sun and Ultra Moon Pokédex additions available right from the very first few routes of the game.