Shadow Shield

Shadow Shield serves as a powerful defensive ability that provides significant bulk when its user is at maximum HP. The ability halves all regular damage taken from attacks while the Pokémon remains at full health, effectively doubling the user's effective HP pool for the first attack they receive. This protection only applies to standard damage calculations from moves and does not affect fixed damage sources like Seismic Toss or damage from status conditions such as burn or poison.

What makes Shadow Shield particularly notable is that it cannot be suppressed or nullified by abilities like Mold Breaker, moves like Gastro Acid, or items like Ability Shield. This immunity to ability suppression ensures that the defensive boost remains active regardless of the opponent's attempts to bypass it. The ability only functions when the Pokémon is at exactly full HP, meaning any prior damage from entry hazards, status conditions, or previous attacks will deactivate the protection until the Pokémon is fully healed.

Lunala is the sole possessor of this ability, and Shadow Shield plays a crucial role in its competitive viability. The ability allows Lunala to survive powerful attacks that would otherwise OHKO it, providing opportunities to set up with Calm Mind or retaliate with its signature move Moongeist Beam. This defensive cushion is particularly valuable given Lunala's modest bulk and numerous common weaknesses, making Shadow Shield essential for its role as a setup sweeper or wallbreaker.