Holy... Alice on Expert Mode is insane with the difficulty curve

I've been trying to beat her for the past few days, created all sorts of teams and looked up tips on how to beat her but I can't even put a dent in her. I'm just baffled how hard she is compared to the rest of the game up to that point. Gliscor and Pinsir just melts my team every time, plus the long walk back after trying to change my team to try new tactics suuuuuucks. Granted, this is my first Rom hack where I'm trying to do a harder difficulty and don't fully grasp the IV (or EV's? Idr) system quite yet because I was always casual with Pokémon games so I'm trying to learn but just damn, is the rest of the game going to be this challenging? 😂 Thanks for reading my mini-rant, I know I'm gonna figure it out and will take advice because what I'm not doing is working, its just that difficulty spike was such a sucker punch, I almost got whiplash from it lol