Secret Sword is the signature -type move of Keldeo. This move can be learned by via tutoring when the three musketeers; Terrakion, Cobalion, and Virizion are also in the party and the player visits an old man in the Moor of Icirrus. It, however, is weaker than its counterpart, Sacred Sword.
The user cuts with its long horn. The odd power contained in the horn does physical damage to the target.
</gallery> 800px-Keldeo Resolute Form Secret Sword-1-.png|Keldeo using Secret Sword