Doublade (who else wants to call it Duoblade?) is the evolution of Honedge and, as you can see, it has gained an extra sword upon evolving. These two swords communicate with each other telepathically and carry out complicated attacks.
The screenshots show Doublade's Fighting type Sacred Sword move which is not affected by stat changes on the target Pokemon. In this case its target is Pyroar.
Doublade is 2'07" tall and weighs 9.9lbs. Wonder if it will get three blades if it evolves again.