Professor Oak (anime)/History/XY series

Professor Oak appeared briefly in A Battle of Aerial Mobility!, where he was introduced to before being shocked by Rotom.

He was later mentioned in Battling on Thin Ice!, where it was revealed that Ash and both attended his Pokémon Summer Camp during their childhood.

In Till We Compete Again!, he joined in on a video call with Delia to Ash and his friends, where he learned Ash was going to return to Pallet Town later that day.