SM OU RMT how can I improve my team?

[Ukkoclap]

This is my team. but i feel my team is missing something. Maybe swap out something to setup hazzards and also dealing with hazards such as defog or spinning. Some threads im facing is celesteela my only pokemon able to deal with it is koko but its pretty obvious when i switch it in.

I'm thinking of putting away celesteela, scissor, but not sure what to replace them with.

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 80 Def / 176 Spe
Impish Nature
- Toxic
- Earthquake
- Protect
- Substitute

Garchomp @ Life Orb
Ability: Rough Skin
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Earthquake
- Swords Dance
- Fire Fang
- Outrage

Toxapex @ Leftovers
Ability: Regenerator
EVs: 252 HP / 252 Def
Calm Nature
IVs: 0 Atk
- Haze
- Scald
- Recover
- Toxic

Tapu Koko @ Choice Specs
Ability: Electric Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 1 Atk
- Hidden Power [Fire]
- Volt Switch
- Thunderbolt
- Dazzling Gleam

Scizor-Mega @ Scizorite
Ability: Technician
EVs: 252 Atk / 252 Def / 4 SpD
Adamant Nature
- Bullet Punch
- Bug Bite
- Roost
- Swords Dance

Celesteela @ Leftovers
Ability: Beast Boost
EVs: 248 HP / 104 Def / 156 SpD
Relaxed Nature
- Leech Seed
- Heavy Slam
- Flamethrower
- Protect

 

[Snowy]

Welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide in-depth descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.