Turtwig

Diamond: Made from soil, the shell on its back hardens when it drinks water. It lives along lakes.

Pearl +2: It undertakes photosynthesis with its body, making oxygen. The leaf on its head wilts if it is thirsty.

Platinum: The shell on its back is made of soil. On a very healthy TURTWIG, the shell should feel moist.

HeartGold +3: Photosynthesis occurs across its body under the sun. The shell on its back is actually hardened soil.

Black +3: The shell on its back is made of soil. On a very healthy Turtwig, the shell should feel moist.

Legends: Arceus: This Pokémon becomes more energetic the more sunlight there is. The part resembling a shell is similar to silt and is slightly damp and warm to the touch.