Jirachi

“A legend states that JIRACHI will make true any wish that is written on notes attached to its head when it awakens. If this POKéMON senses danger, it will fight without awakening.”

— Pokémon Ruby

“JIRACHI will awaken from its sleep of a thousand years if you sing to it in a voice of purity. It is said to make true any wish that people desire.”

— Pokémon Sapphire

“JIRACHI is said to make wishes come true. While it sleeps, a tough crystalline shell envelops the body to protect it from enemies.”

— Pokémon Emerald