Shinyvanillish

I really dont know what to do, I dont play seriously so i just find a pokemon i like and level it to 100. I have a level 100 Flygon Feraligator Chandelure Haxorus and Gengar. My friend was stuck on this too but someone let him use a snorlax that won for him. Hes tried letting me use his hydreigon gallade and charizard but nothing is working. Ive spent 50k on revives trying to luck out with flinches or misses or whatever. Mega metagross always sweeps my entire team and if I luck my way past him then volcarona does. Someone recommended ferroseed so I spent 20k on visits to steel valley and 10k on repels and didnt find one. Ive asked if I could borrow a pokemon frequently for 3 days now but no one will help. Ive even offered any of my pokemon if they help. Ive given up completely and my friend is going to go to sinnoh without me. I still go on every couple hours to ask if anyone will help though. What should I do?