Avery is a character of the day who appeared in Here Comes the Trubbish Squad! (BW012). His friends sometimes refer to him as Avey (Japanese: ヒロタン Hirotan) as a nickname.
Avery is a kindergartner who goes to a Kindergarten run by Daniela. One day, Avery and his friends found a Trubbish at a garbage dump near the Kindergarten. He took it to Daniela, who thought it would eat the children's toys. This led her to return it to the dump. Avery and his friends were angered by this and turned the dump into a secret base, rebelling against Daniela. When Ash and his friends were on their way to Nacrene City, Avery and his friends came by on their tricycles, throwing mud balls at Ash and taking his hat.
When Ash tried to get in the secret base, Avery took him in as a hostage, but came to like Ash and his Pikachu. He even gave his hat back. Then, a Sandile appeared and attacked Avery, but Trubbish saved him. When the base started to collapse as a result of the attack, Daniela quickly saved Avery from being crushed by a box. In the end, Daniela's attitude towards Trubbish softened and Avery and his friends were allowed to keep it.
He reappeared in a flashback in Explorers of the Hero's Ruin! (BW064).
(Source: Bulbapedia)
