I've been focusing on the Cheren/Norman clashes, for those are two battles, so this is what I have:
As far as I'm concerned, Norman gets an advantage with Staraptor's Close Combat. It will drop it's stats, but that bird is awesome. Castform can also change variables in weather, but Cheren can do so too... But Slaking can always make his pokemon fall asleep so that his ability won't be such a weakness. Exploud has Soundproof so Cheren can't make it fall asleep. Sawsbuck can also be a help with seed attacks and causing/healing stats.
But, beware of Cheren's Porygon-Z cause it can do a diversity of moves, so take caution. Stoutland's Intimidation can also affect us greatly and Lopunny can also do fighting moves. Cinccino can also be a danger to us if we don't keep our backs prepared... Will post on other battles.
P.S. We are doomed with N Vs Steven. Trying to think of something for that, but we should prepare for the worst...