There's actually an AR cutscene that you need the back of the little instruction manual on anyway, so that's a good idea. And unless you stick to the main part of the story, be prepared for a pretty long game. I'm about 22 hours into mine and I just started Chapter 3.
Thought of another Xerneas counter: Specially Defensive Unaware Clefable. 252 SpA Fairy Aura Xerneas Moonblast vs. 252 HP / 252+ SpD Clefable: 160-190 (40.6 - 48.2%) -- guaranteed 3HKO after Leftovers recovery You can set up Calm Minds, heal with Moonlight, and proceed to sweep the opponent afterward. For attacks, you should use Moonblast and Flamethrower/Fire Blast. Moonblast is the obvious STAB option, while Flamethrower/Fire Blast hits Steels (except for Heatran).
Swagplay is a lot more deadly this gen because as you mentioned it's neutral to steel and there is an inflation of physical attackers in the metagame. I haven't seen a lot of mandibuzz with swagger though, since it suffers from four move syndrome this gen. The demand for physical defense and the knock-off/defog buff is a better reason for its popularity. Swagplay is getting attention due to reports of people getting destroyed by it and the fact that it's a very luck based strategy, but yeah in the end they're just overreacting. Some people even want to remove confusion altogether, without realising that it balances moves like outrage. In the end I feel like swagplay is a high risk high reward move: you'll most likely fail but it works with good luck. It's not broken like evasion, since you can simply switch out to remove confusion rather than being forced to roar evasive opponents, or as gamechanging as OHKO moves. It's also funny how most of them are completely okay with scald, probably THE most common luck based move that is even more devastating due to burn halving attack. Luck was always involved in battling, and a lot of people fail to see that confusion plays just a small part of it.
Thanks, I see. I figured I am just going to let him do what he wants. I can't very well travel to where he is and give him a beating that only an Afrikaner can give and nothing I can say online would change a thing. all I can do is wait him out till he gets bored.