Brendan appeared in the Pokémon Omega Ruby and Pokémon Alpha Sapphire Animated Trailer, where he was first seen sleeping in his house in Littleroot Town. A Treecko comes by and woke him up. He ran to May's house as the starter Pokémon were playing with one another. Brendan encountered a Youngster and battled his Zigzagoon with Treecko.
Later, sometime after his Treecko evolved all the way up into Sceptile, Brendan battled Steven and his Mega Metagross. Brendan then soared in the sky with his Mega Latios alongside May and her Mega Latias.