They're fighting twice consecutively, and N will be present in the first episode. It is more likely than not that the episodes will be connected.No it won't. Charizard is fighting Dragonite because Dragonite is controlled by Colress. It has nothing to do with their rivalry in the previous episode.
Except I am not saying that N's past should warrant a two-parter. I am saying that N's past, the introduction of Ghetsis, Concordia and Athena, and N's motivation for rejoining Team Plasma should warrant one episode that doesn't have other events crammed into it.Everyone was saying the same about Colress and Team Plasma's first appearance: that there was too much and it would have to be a two-parter. It wasn't.
Iris got four episodes with flashback sequences. If you combine them, you get roughly one episode's worth of scenes, and Iris doesn't even have a particularly deep backstory. I am not saying that the episode should be limited to flashbacks, anyway. But the Castelia action with Charizard and Dragonite? That would be random.The Reshiram thing will be covered obviously, and his childhood isn't likely to be shown in much depth: just enough to establish what it was like before transitioning to N as an adult and when Reishiram burned down the castle (where the scene with him and Ghetsis obviously transpires during.)
Iris' childhood flashbacks never took up entire episodes, N's doesn't need to either. One episode accomponied by a present-day plot in Castelia is enough.
I doubt that Ash and N would fight over that.Colress isn't just brainwashing Dragonite, he's brainwashing all the Pokemon of the biggest city in Unova. N would easily join TP if they agreed to stop hurting Pokemon like this.