Magikarp Jump by Pokémon
Raise the ultimate Pokémon
Electa.bz a Pokémon squad builder built to support the Ultra Sun and Ultra Moon games launching today (November 17th!). It's leveraged by PokéAPI and exists as a responsive web app for now. V1 supports items, moves, natures and abilities, and links to Serebii.net to help you build your squad.