The latest news for Pokémon Horizons is out. According to some promotional material, Iono is set to be formally introduced to the anime in Episode 15, "Someone We Can't See! Whosawhatsit?" There's plenty that can be done with this character. Not only is she the Paldea region's Electric Gym Leader but she's also a streamer. She shares the latter trait with the anime's tritagonist, Dot. This similarity could mean that the two are destined to meet.
Source:https://www.cbr.com/pokemon-horizons-theory-iono-dot-collab/