I've been running a fairly similar build
Charizard @ Charizardite Y
Ability: Blaze
EVs: 204 Atk / 52 SAtk / 252 Spd
Lonely Nature
- Flare Blitz
- Solar Beam
- Earthquake
- Fire Blast
This set mostly focused purely on smashing stall and luring in chansey for the guaranteed 2HKO without rocks. With rocks can secure a couple more 2HKOs on "counters" to zard y like goodra and latias (although latias can outspeeds and heal but it is forced to recover giving opportunity to go to a trapper). Even with minor special attack investment zard-y hits like a truck against most unresistant mons like lando and gliscor. Been using this alongside RP lando who really likes the sun weakening water moves for setup opportunity and really appreciates the removal of or at least severe weakening of mons like chansey and stall over all.