Greninja vs Mismagius (Series Finale of Mismagius Gets Grounded) 

In the third and final episode of Mismagius Gets Grounded (as well as the second episode of Greninja Gets Ungrounded), Greninja defeats Mismagius, and Zygarde uses Core Enforcer on her to completely erase her from existence. This, in turn, ends her grounded series and a new start for the Aura Trio.