Shelgon

“Inside SHELGON’s armor-like shell, cells are in the midst of transformation to create an entirely new body. This POKéMON’s shell is extremely heavy, making its movements sluggish.”

— Pokémon Ruby

“Covering SHELGON’s body are outgrowths much like bones. The shell is very hard and bounces off enemy attacks. When awaiting evolution, this POKéMON hides away in a cavern.”

— Pokémon Sapphire

“It hardly eats while it awaits evolution. It becomes hardier by enduring hunger. Its shell peels off the instant it begins to evolve.”

— Pokémon Emerald