Elio has an A.U. where he's a Pokemon Ranger, so him being heavily involved in the Ranger games would be expected; alternatively, him being isekai'd into the Mystery Dungeon universe as either a Marshadow or Larvesta, is, again, not out of the ordinary. Also, as a trainer, he would be in the Battle Revolution or Pokken games as a trainer - with him being the trainer of Darkrai or even Marshadow, most likely as a Secret Boss.