Burmy-Sandy

Diamond +2: To shelter itself from cold, wintry winds, it covers itself with a cloak made of twigs and leaves.

Pearl +2: If its cloak is broken in battle, it quickly remakes the cloak with materials nearby.

Platinum +4: Even if it is born where there are no cocooning materials, it somehow always ends up with a cloak.

HeartGold / SoulSilver: It covers itself with a cloak to shelter from the cold. When it’s hot, its cloak is thinner.

Legends: Arceus: If its cloak is even slightly damaged, Burmy will immediately repair it with whatever is close at hand. The Pokémon within the cloak is scrawny and vulnerable to the cold.