Grotle

Diamond +2: It lives along water in forests. In the daytime, it leaves the forest to sunbathe its treed shell.

Pearl: The shell is hardened soil. Some Pokémon come to peck the berries growing on the trees on its back.

Platinum +6: It knows where pure water wells up. It carries fellow Pokémon there on its back.

HeartGold / SoulSilver: A GROTLE that lives in the forest is said to have its own secret springwater.

Legends: Arceus: Appears where there is clean spring water. The fruit that grows on the shrubs on its shell is sweet, nutritious, and truly delicious.