Pokémon S17E30 - The Cave of Trials!

Having teamed up with Korrina, Ash & co. arrive in Geosenge Town in search of the Lucarionite, the Mega Stone Korrina needs to Mega Evolve her Lucario. Having learned that the Mega Stone is found within a nearby cave, they go to investigate. However, while there, they find Team Rocket beat them to it and got blasted off by a mysterious force in the cave. Upon investigation, they discover that a Blaziken is in the cave and must be defeated to get the Lucarionite. Can Lucario defeat it?