Ultra Beast

The Ultra Beasts (Japanese: ウルトラビースト Ultra Beast) are a group of extradimensional Pokémon originating from Ultra Space. They possess power that transcends humans' understanding of the world.

Ultra Beasts infrequently appear from Ultra Wormholes in Alola. These appearances are apparently as unexpected for the Ultra Beasts as for Alolans, which tends to make them combative. They are especially drawn to people who have passed through an Ultra Wormhole, due to the residual wormhole energy on them, apparently expecting to find a wormhole they can use to return home.

There are currently eleven known Ultra Beasts: All Ultra Beasts share the Ability Beast Boost.
 * Nihilego (codenamed UB-01 Symbiont)
 * Buzzwole (codenamed UB-02 Absorption)SUS
 * Pheromosa (codenamed UB-02 Beauty)MUM
 * Xurkitree (codenamed UB-03 Lighting)
 * Celesteela (codenamed UB-04 Blaster)MUM
 * Kartana (codenamed UB-04 Blade)SUS
 * Guzzlord (codenamed UB-05 Glutton)
 * Poipole (codenamed UB Adhesive)USUM
 * Naganadel (codenamed UB Stinger)USUM
 * Stakataka (codenamed UB Assembly)UM
 * Blacephalon (codenamed UB Burst)US

When encountered in the wild, the residual energy from Ultra Wormholes manifests as a red aura that boosts one of their stats at the start of battle, similar to a Totem Pokémon's orange aura. Wicke theorizes that they store this energy in their bodies.

Most Poké Balls have difficulty recognizing Ultra Beasts as Pokémon due to their extradimensional origins, impairing their ability to effectively catch them. Only the Master Ball and Beast Balls escape this impairment.

Although unconfirmed, Aether Foundation scientists hypothesized that Cosmog is also an Ultra Beast, due to its ability to create Ultra Wormholes. Necrozma's Pokédex entry also states that it is "reminiscent of the Ultra Beasts", but when it was in the wild, the International Police reported that all Ultra Beasts it had detected had been caught, and Beast Balls are not effective at catching it. Additionally, Dulse refers to Necrozma as "a creature almost like an Ultra Beast" in Pokémon Ultra Sun. In the anime, the Aether Foundation, mistaking Necrozma for an Ultra Beast, gives it the codename "UB Black".