Pyroar first appeared when it interrupt a battle between Alain's Mega Charizard X and Steven's Mega Metagross by using Flamethrower and jumped onto the field to stop them from battling any further, per Lysandre's command. Moments later, Alain remembered the Pokémon when he was searching for a Mega Stone where Lysandre appeared, who had taken the Mega Stone prior to Alain arriving. Alain had his Charmeleon, at the time, battle Pyroar, but lost the battle.
Pyroar stood by Lysandre, who observed the situation in Hoenn, when his team retrieved the megalith.
Pyroar was summoned against Ash and Alain's Pokémon along side his Gyarados. Pyroar and Gyarados' Incinerate were countered by Pikachu's Thunderbolt and Goodra's Dragon Pulse. Pyroar then blasted Greninja with Hyper Beam and blocked Noivern's Dragon Claw with Fire Fang but left himself open to Hawlucha's Karate Chop. The attack knocked him down, allowing Pikachu to finish him with Thunderbolt.