Azelf

“Known as “The Being of Willpower.” It sleeps at the bottom of a lake to keep the world in balance.”

— Pokémon Diamond

“It is thought that UXIE, MESPRIT and AZELF all came from the same egg.”

— Pokémon Pearl

“When AZELF flew, people gained the determination to do things. It was the birth of willpower.”

— Pokémon Platinum