While it is not known to evolve into or from any Pokémon, Keldeo has a second form from Pokémon Black 2 and White 2 onward, which requires it to know the move Secret Sword. Its original form, Ordinary Form, will then become Resolute Form.

On what level does Keldeo evolve?

Keldeo (Japanese: ケルディオ Keldeo) is a dual-type Water/Fighting Mythical Pokémon introduced in Generation V. While it is not known to evolve into or from any Pokémon, Keldeo has a second form from Pokémon Black 2 and White 2 onward, which requires it to know the move Secret Sword.

Is Keldeo a legendary?

The Swords of Justice consist of Cobalion, Terrakion, Virizion, and Keldeo. They are a quartet of Legendary Pokémon that appear in the Unova region.