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 Ultra Sun and Ultra Moon/Version Differences — StrategyWiki

Pokémon Gold and Silver — StrategyWiki

Pokémon HeartGold and SoulSilver Versions - Bulbapedia, the community-driven Pokémon encyclopedia

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

Pokémon Ultra Sun and Ultra Moon/Version Differences — StrategyWiki

Pokémon Sun and Moon/Ultra Beasts — StrategyWiki

Pokemon Sun & Moon: Key Items & Free Pokeball Locations Guide - Gameranx

Pokémon Ultra Sun and Ultra Moon — StrategyWiki

Fiery Path, Pokémon Wiki

Pokemon Ultra Sun/Ultra Moon details, screenshots, art - Ultra Beasts, Ultra Wormholes, Ultra Recon Squad