Gary Oak Is Returning to the Pokemon Anime - IGN

Gary Oak hasn't been seen in the Pokemon anime since Pokemon the Series: Diamond and Pearl, but it seems he'll soon appear in Pokemon Journeys.
Gary Oak hasn't been seen in the Pokemon anime since Pokemon the Series: Diamond and Pearl, but it seems he'll soon appear in Pokemon Journeys.

Pokemon

Smell ya later, Red! Gary Oak/Blue Wants to Battle!

Gary Oak, Heroes Wiki

DP045 - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon: 15 Things You Didn't Know About Gary

Will Gary Oak return in Pokemon Journeys? - Quora

Pokemon

Pokémon: How Gary Oak's Character Developed Throughout the Anime

A Pokémon Retrospective: Generation 2 - 1999 To 2002 - Feature

Pokémon: Gary Oak's Most Competitively Viable Team, Explained

Gary Oak, Pokemon Return of the Champion Wiki