Shadow Shield in Pokémon Ultra Sun & Ultra Moon

Reduces the amount of damage the Pokémon takes while its HP is full.

When this Pokémon has full HP, regular damage from moves is halved.

At full HP, damage from attacks is halved; fixed-damage moves are unaffected. Shadow Shield cannot be bypassed by Mold Breaker or comparable ignoring effects, but it can still be changed or suppressed.