I have to agree that Alder may leave his Champion post (maybe for a post-game fight in the Relic Castle, in the Volcarona chamber?) but I think that we'll get version-exclusive Champions with Iris and Drayden switching off while the other is the Opelucid Gym Leader. I think it's too soon for Cheren to be a Champion (though I expect to fight both him and Bianca) but another possibility for the Champion slot might be Marshal, Alder's original student.
If N is not part of the storyline, he, Ghetsis and the Shadow Triad will almost certainly be part of an event-exclusive story like what Giovanni got in HGSS. I do expect them to be vital to the story, though, given that Kyurem achieving its full forms will require the dragon N caught in the original Black/White story.
On another note, I think Akuroma may be related to Ghetsis and possibly be a Team Plasma member himself. He looks much more like Ghetsis than N does (his weird blue curl of hair is similar to the three curls Ghetsis has) and his one line of dialogue thus far - "And if you use the item that activates the Pokemon I created" - suggests he might have had something to do with Genesect.
no subject
If N is not part of the storyline, he, Ghetsis and the Shadow Triad will almost certainly be part of an event-exclusive story like what Giovanni got in HGSS. I do expect them to be vital to the story, though, given that Kyurem achieving its full forms will require the dragon N caught in the original Black/White story.
On another note, I think Akuroma may be related to Ghetsis and possibly be a Team Plasma member himself. He looks much more like Ghetsis than N does (his weird blue curl of hair is similar to the three curls Ghetsis has) and his one line of dialogue thus far - "And if you use the item that activates the Pokemon I created" - suggests he might have had something to do with Genesect.