Well for one you seem a little confident that you'll beat her but at least you're not phazer
And two I don't think you know how the League works but that's not a huge deal << >>
it totally is.
AS FOR THE ACTUAL RMT THING
Looks good as a whole- you've used multi-target moves wherever possible (even if Braviary seems to be the only choice for that) and a decent strategy that not many of the leaders run themselves...
Serperior is pretty standard but extremely single-target so it stands a good chance of getting wrecked in multi-battles, moreso by special threats because you have Reflect. That's not to say it'll be useless though.
Braviary seems pretty standard too, not much to say here. I'm sure you're only using Rock Slide for Sheer Force, but, that works out well for possible triple battles, and nearly matches the power of Stone Edge for single battles. Good.
Keep in mind with Cacturne that, although Sucker Punch is good, it's useless if you get out-predicted; i.e. I doubt the Psychic leader will try to attack you knowing a Sucker Punch is waiting. Grass and Electric don't have the best coverage; steel-types for one will probably run you over considering its low speed and resistance to Sucker Punch.
Slowking doesn't have the best Sp.Atk but I suppose it's passable since STAB and anything weak to Ice that matters is probably 4x weak to it. Trick Room seems to be a good strategy, but keep in mind the other leaders that use it will probably use it against you. And really it's not hard to lower your Speed IV to 0 and use a negative nature, if they choose to
Emboar seems standard, Reckless with as many recoil moves as possible. I don't think there's really anything that can wall that, but I imagine you'd probably be taking yourself out pretty quickly with all that recoil plus stray attacks in doubles/triples, especially considering most Flying attacks can reach anywhere in triples.
Golurk is a good choice for Trick Room because it's so bulky and has really good Attack, but horrendous Speed without Rock Polish. Looks solid, but your only option in Triples to hit everything is to spam Earthquake and hurt yourself too. If you're okay with that, then it seems legit, in the most honest sense of the phrase.
Overall, aside from Serperior, everything seems to have low-mediocre speed, so if your Trick Room gets stopped somehow (or even reversed by another use of it; I'm looking at you, Saya) you could be in trouble. At the same time, Natures, items and EVs are readily changeable, so maybe that isn't a huge problem. You don't have many multi-target moves; I'm not one to talk though, cause lol:
Neither did I.
Carracosta having Earthquake is a mistake I just now noticed; pretty sure that should be Waterfall.
Regardless with enough skill I'm sure this should work out at least decently.