Regeneration. Giratina regains 20 hit points at the start of each of its turns. If it takes poison or psychic damage, this trait doesn't function until the end of its next turn. Giratina dies only if it starts its turn with 0 hit points and doesn't regenerate.

Shadow Sneak. Giratina is invisible while in darkness.

Legendary Resistance (4/Day). If Giratina fails a saving throw, it can choose to succeed instead.

Multiattack. Giratina makes 6 Shadow Claw attacks.

Shadow Claw. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 25 (3d8+10) slashing damage and 21 (6d6) necrotic damage.

Dragon Pulse (Recharge 5-6). Giratina unleashes a blast of energy in a line 15 feet wide and 300 feet long. Anything in the area of the blast must succeed on a DC 27 DEX save or take 88 (16d10) necrotic damage, taking half damage on a success.

Shadow Force. Giratina teleports to an unoccupied space within 30 feet of it. Each creature within 10 feet of it after it teleports must make a DC 27 CON saving throw or take 13 (2d12) necrotic damage, taking half on a success.

Giratina can take 4 legendary actions, choosing from the actions below. Only one legendary action can be used at a time, and only at the start of another creature's turn. Giratina regains spent legendary actions at the start of its turn.

Shadow Sneak. Giratina uses its Shadow Sneak.

One With Shadow. While invisible, Giratina can teleport up to 90 feet to another location of dim light or darkness.

Dragon Tail (Costs 2 Actions). Giratina sweeps its tail in a 25-foot cone originating from it. Each creature in that area must succeed on a DC 27 DEX save or be knocked prone and take 21 (6d6) bludgeoning damage and 21 (6d6) piercing damage.