I'm not sure about that. I've never tried that, plus it's hard for me to keep track of what stat boost(s) each Horde Mon gives, so I just ST. Sure, ST takes longer, but I'm patient enough to sit through it.
Well, I'm already bringing the Arcanine in my current competitive team along for the Kanto competition, along with Wigglytuff, Jolteon, Sandslash, Slowbro, and Articuno (my team couldn't possibly be the same without an Ice type). I'm also gonna bring along a Venusaur, Jynx, Gengar, and Dragonite to rotate my team from time to time, though I kind of just wanna troll the competition with a Venusaur named Pingasaur, and all the Jynx haters by having Jynx around
EV training is easier in Gen 6, with Horde Battles and Super Training around. Some people prefer Hordes, but I think ST gives me an easier time keeping track of everything I need. And in a while, I'm gonna be breeding and training for the Kanto Classics competition later this month.
Honestly, at this point, I don't think it should continue anymore. I'm looking to write it off with a little ending summary (kind of like how you did with Ellie in SS2) and that way we can say it didn't have some cliffhanger ending.
But yeah, we could invite him to BGO. I don't see why not.