My only other advice is to be careful with the Trick Room setters and the probably Darmanitan-Zen that will follow them. Strategy-Caitlin's team is another one that falls victim to the "Lead with a Dark Type" Strategy. Only extra advice is to make sure that Bisharp doesn't Metal Burst you too hard if you're running a Nuzlocke.
Strategy-Due to unforeseen Justified Lucario/Verizion/Cobalion/Terrakion/Keldeo, Grimsley is unable to comment. Strategy-Watch the Sableye so that it doesn't ruin your sweeper with the Lagging Tail and prepare to steamroll Shauntal with either the Zoroark that you kept with you since Driftveil or another Ghost or Dark type you picked up along the road. Why you would want to take this challenge is beyond me even though I took it myself, but anyways, heading in you're going to want to be over leveled, and hopefully you picked up a few legendary Pokémon on your way here as this place is meant to absolutely destroy your hopes and dreams.
1 Elite Four And Champion 1st Match (Normal Mode).