Accelgor

“When its body dries out, it weakens. So, to prevent dehydration, it wraps itself in many layers of thin membrane.”

— Pokémon Black

“Having removed its heavy shell, it becomes very light and can fight with ninja-like movements.”

— Pokémon White

“When its body dries out, it weakens. So it wraps a membrane around itself for protection while it spits poison.”

— Pokémon Black 2