Considering whose focus it is it should go to Gary or Ash, every time we've gotten a Raid battle Goh hijacked it. Got Golurk, oh look plot convenience and Ash is forced to back out of Zapdos, Ash sits on the side while Goh gets Flygon.... it's repetitive. Especially as he hijacked Absol's episode only a few episodes ago
The episode is supposed to be centered around Infernape and Gary, it should remain that way. If Gary is being built up to as a future PWC opponent then Moltres would be a pretty cool addition as apart from Blastoise/Umbreon/Electivre the rest of his team isn't very memorable or developed. He lacks a good fourth/fifth/sixth member of his squad. Maybe we could actually see Infernape fight it on his lonesome too. Seeing how he came for Moltres from what it implies, it sounds like he's getting it
As for Ash, eh. Fire always seemed like his type specialty, it'd be somewhat fitting if his first legendary was a Fire type(You could also argue on Flying/Fighting but Moltres fits the Flying category
). Ash doesn't seem like the type to throw a ball though, he'd either ask or Gary would push him to do so saying he earned it. Again I think Gary's getting it, be amusing to see Moltres participating in the air races that Ash's Flying types do though lol