Like chester said, Battling101 is the right place. Or, on showdown, type "/join competitive tutoring" inside any chatbox and you will be redirected to a room that will help.
That said, there's no way to say what exact set to run because it'll depend on your team. But if you're sticking to fast special sweeper, and building a team around it, then I'd recommend this set personally.
CHARIZARD
Item- Charizardite Y
Ability- Drought
IV's- 31/0/31/31/31/31
Nature- Timid
Fire Blast
Air Slash
Solar Beam
Dragon Pulse
Fire blast > flamethrower imo, its not worth the damage drop.
You will want to have a rapid spinner (or defogger but spin is preferable as it keeps your hazards up), yes, because 50% damage is too much. EQ is a definite no-no imo because he is a special sweeper. Roost could replace dragon pulse if you'd like, but really he is not a bulky mon and isn't expected to take hits. Although, if you have trouble keeping down hazards, roost might be a good investment.