In this thread, we come up with new abilities for the Ultra Beasts

Hard Mode: Keep them from becoming broken

I'll start:

Blacephalon
>Ability:
Explosive Spirit - when hit with any Fire-type attack, instantly uses the move Explosion
>Move
Fireworks - A Fire-type Boomburst

Stakataka
>Ability
Dimensional Twist - causes Trick Room upon entering the field (this is pretty overpowered)
>Hard Mode Ability:
Impregnable - when using moves like Protect, Substitute, etc. they will always go off and can't be bypassed or cancelled by the opponent
>Move
Ramparts - protects for the turn. If struck, "falls apart" on the opponent and lowers their Speed

Nihilego
>Ability
Intoxicating - when the target is Poisoned, they are Attracted as well
>Move
Addicting Grip - traps the target and causes Attraction