Doublade

“When Honedge evolves, it divides into two swords, which cooperate via telepathy to coordinate attacks and slash their enemies to ribbons.”

— Pokémon X

“The complex attack patterns of its two swords are unstoppable, even for an opponent greatly accomplished at swordplay.”

— Pokémon Y

“Honedge evolves into twins. The two blades rub together to emit a metallic sound that unnerves opponents.”

— Pokémon Sword