I honestly have no idea who Avery is. I don't remember encountering this trainer, but judging by his picture, I can say he looks really tacky. The Gym Challenge uniform looks alright, but those shoes and a top hat to match? Who dressed this guy? lol
Why u no haz Johto mons? Are you that bad at catching mons that all you could obtain is Pidgey?
Klara ?
I take it you have Sword ? Avery was your rival/opponent in IoA in Shield only. In Sword it's Klara.