Barret first appeared with two other grunts looking for N under Ghetsis's orders. Barret was able to find N when he used a locator inside his briefcase and deduced the hidden location. With N found, Barret started attacking the Pokémon with Magnezone but Anthea and Concordia's Gardevoir and Gothitelle blocked the attacks with Protect. Ash decided to deal with Barret while Iris and Cilan handled the other two. While Cilan's Pansage attacked Magnezone, a collision of Bullet Seed and Magnet Bomb caused an explosion. The seeds went flying in which Pignite's snout became stuck by one of the stray seeds. With Barret's Magnezone defeated by Pikachu afterwards, a fog occurred which prevented Barret from seeing anything and allowed Ash and his friends to get away. Barret became upset about not being able to capture N and left the forest.
In Meowth, Colress and Team Rivalry!, when Team Rocket hacked into Team Plasma's data, the trio imprisoned Barret, Aldith and the grunts while they were running off with the data. However, Barret had Magnezone confuse some nearby Pokémon to break them free.
Barret, like the other Team Plasma Grunts, is able to follow orders from Colress. Also, he appeared to be a leader figure similar to Aldith, even going as far to provoke Ash. Also, he does not like it when someone interferes with his plans and Team Plasma's as evidenced when he encountered Ash and Team Rocket, two different times, and mentioned them to Colress.
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Magnezone is Barret's main and most reliable Pokémon. He used it while battling against Ash and his friends, who were trying to stop the Grunts from getting to N, Anthea, and Concordia. Magnezone battled against Ash's Pignite and Oshawott, and proved to be quite strong by being able to defeat Pignite despite the double type-disadvantage. Ash then used Pikachu, whose Electric attacks subdued Magnezone's ones, taking it out.
It was used in the next episode to fight Team Rocket. After Barret and Aldith were trapped by Team Rocket, Magnezone used Supersonic to confuse nearby Pokémon causing them to attack the machines creating the cage.
Similar to other members of Team Plasma, Barret was shown to have a Liepard. He commanded it along with the other Liepard belonging to the other grunts to battle Cedric Juniper's assistants and to block their way.