Need advices for Mega Glimmora team

Hi guys, I'm new to VGC and I'm currently trying to build a team around M-Glimmora. Here's what I have right now :

Glimmora-Mega @ Glimmoranite
Ability: Toxic Debris
Level: 50
EVs: 2 HP / 32 SpA / 32 Spe
Timid Nature
Spiky Shield
Earth Power
Sludge Bomb
Power Gem

Very basic set, Timid nature to outspeed any form of Mega Charizard, and then it's just coverage and spiky shield.

For the 2nd and 3rd Pokemon I thought about Heliolisk and Corviknight. Heliolisk has a good matchup against Rain teams, he's a very good check to Basculegion, and he also offers speed control with electroweb. While Corviknight can check Garchomp, Excadrill, Sneasler and Tyranitar.

Heliolisk @ Magnet
Ability: Dry Skin
Level: 50
EVs: 2 HP / 32 SpA / 32 Spe
Timid Nature
Ally Switch
Electroweb
Hyper Voice
Quick Attack

Corviknight @ Leftovers
Ability: Mirror Armor
Level: 50
EVs: 32 HP / 20 Def / 10 SpD / 4 Spe
Impish Nature
Iron Head
Roost
Body Press
Brave Bird

I'm not sure about the EVs on Corviknight, I added 4 Speed to make sure I outspeed Sinistcha, and I added some SpD bulk for Floette Mega. Maybe I should consider adding Tailwind to him too ?

For the 3 last, I'm not sure yet.

I thought about adding
Farigiraf or Sinitcha with Imprison + Trick Room for the TR matchup, but I'm not sure that Farigiraf is very relevant in this kind of team tbh.

Then priority moves that helps me set up, so it's either Incineroar (could be good with intimidate, throat chop and parting shot) or Sneasler (good speed, extremely dangerous in the meta right now, dire claw status)

And last but not least, I thought about a scarf revenge killer, either Garchomp or Basculegion himself.

Sorry it's a long post, but if you have any thought or review to share to help me with this team that'd be great ! Thanks 😄