Pokémon Sun and Moon/Ultra Beasts — StrategyWiki

Ultra Beasts are unusual creatures from another dimension. The Aether Foundation researches them. They all have a signature ability shared: Beast Boost.

Pokémon Sun & Moon - The Ultra Beasts

Pokémon Sun and Moon Walkthrough - Part 27: How to catch Ultra Beast NIHILEGO! (Post game)

Pokémon Ultra Sun and Ultra Moon - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon Sun and Moon/Version differences — StrategyWiki

Pokémon Ultra Sun and Ultra Moon - Bulbapedia, the community-driven Pokémon encyclopedia

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Ultra Beasts - Pokemon Sun & Pokemon Moon Guide - IGN

Pokémon Crystal Version - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon Sun & Moon - The Ultra Beasts

Chapter 16: Ultra Beast Missions - Pokemon Sun Moon Walkthrough

Pokémon Ultra Sun and Ultra Moon/Version Differences — StrategyWiki

Goldenrod City, Pokémon Wiki