Staryu

“If its body is torn, it can grow back if the red core remains. The core flashes at midnight.”

— Pokémon Black

“An enigmatic POKéMON that can effortlessly regenerate any appendage it loses in battle.”

— Pokémon Red

“As long as the center section is unharmed, it can grow back fully even if it is chopped to bits.”

— Pokémon Yellow