I know this is like asking for nuclear secrets, but has anyone found a dominant team?
I was going for awhile with Eelektross, Electivire, Luxray, Pikachu, Ampharos, Emolga.
Then after running into people for a 2nd time the team was shit.
Switched to Jolteon, Pachirisu, Luxray, Electivire, Eelektross, Ampharos.
2nd time around it was outdated.
Changed up to Lanturn, Heliolisk, Electivire, Luxray, Eelektross, Ampharos.
It seems like the major annoyances are Swagger/Foul Play Electrode, Snarl Manectric, Encore Raichu, and now Ion Deluge Emolga.
I did run an Ion Deluge Zebstrika and it was awesome for about 5 battles.
Scarf Surf Lanturn partnered with Dry Skin Heliolisk worked well, but Scarf Lanturn did nothing to heal Heliolisk until turn 2, again Ion Deluge Emolga messes it up. Protect on Heliolisk stops Fake Out Pikachu/Raichu and scouts Ion Deluge. Fake Out always seems to come Heliolisk.
I had a good run with that combo, but nothing that gives me confident going into the actual event. I guess in the real challenge the chances of someone knowing your play style is slim.
Hell I cannot decide on Modest or Timid Jolteon. I think with Choice Specs the Modest nature wins out. Modest Jolteon is only outsped by Mega Manectric, Electrode, Zebstrika, and mainly Choice Scarf Pokémon.