He briefly reappeared in Mega Evolution Special III where he was with Lysandre while Lysandre was giving instructions to Alain and Steven.
Personality and characteristics
Pyroar comfortably sleeping at Lysandre's abode
Pyroar, as seen in Mega Evolution Special II, is a very loyal to his owner. Pyroar is always seen following Lysandre, helping him in ways he can. He is a serious and a very tight challenger. Pyroar has seemingly high temperament against others, except his owner. When Pyroar distracted the battling Alain's Mega Charizard X and Steven's Mega Metagross, and the two Pokémon reacted to him, Pyroar snarled furiously at them, owing to his fiery nature.
Lysandre's Pyroar first appeared in PAXY09. Pyroar was first seen with Lysandre in Lysandre Café, where he was used to scare Trevor into giving up a picture that was taken in Vaniville Town. Pyroar was stopped by Diantha, who had her Gardevoir Mega Evolve to make him back off.
For more information on this Pokémon's species, see Pyroar.