SM OU Rate My OU Team

[erogon1]

Hey everyone, how's it going? This is my first RMT Post. I've been playing competitive on Showdown for about a month now, but i'm still fairly new and make bad reads sometimes, or don't make reads sometimes. However, despite myself being trash at the game - my highest score on Showdown being 1300 - I feel as though my team may also be missing something, have something it shouldn't, or just has bad synergy. If you guys could make recommendations on how to make my team better please do so! (If it's garbage and i just need to restart, i'll do that too)

My Team:
Celesteela @ Leftovers
Ability: Beast Boost
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Flash Cannon
- Leech Seed
- Air Slash
- Flamethrower

Toxapex @ Leftovers
Ability: Regenerator
EVs: 252 HP / 128 Def / 128 SpD
Careful Nature
- Baneful Bunker
- Haze
- Knock Off
- Liquidation

Thundurus-Therian @ Choice Specs
Ability: Volt Absorb
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Defog
- Focus Blast
- Grass Knot

Venusaur-Mega @ Venusaurite
Ability: Thick Fat
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Hidden Power [Fire]
- Giga Drain
- Sludge Bomb
- Toxic

Mamoswine @ Focus Sash
Ability: Thick Fat
EVs: 252 HP / 252 Atk / 4 Spe
Adamant Nature
- Earthquake
- Ice Shard
- Icicle Crash
- Stealth Rock

Garchomp @ Rocky Helmet
Ability: Rough Skin
EVs: 20 HP / 224 Atk / 12 Def / 252 Spe
Impish Nature
- Aqua Tail
- Dragon Claw
- Fire Fang
- Stone Edge

Thank you to anyone who helps!

 

[Gross Sweep]

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.