Meyer

Meyer is Clemont and Bonnie's father and one of the best engineers in Lumiose City. His secret identity is Blaziken Mask.

Season 17: XY Series
Meyer used his Blaziken (in it's Mega Evolution form) to save Ash and his Pikachu from falling off from Prism Tower after Garchomp was freed from Team Rocket's device. When Clemont attempted to re-capture the Gym from his own robot, Meyer met his friends.

Trivia
He is the first character seen in the mainstream anime to use the Mega Evolution on his Pokémon.