[ORAS] I'd like feedback on the Team

[SjoerdDN]

Politoed (F) @ Damp Rock
Ability: Drizzle
Level: 50
EVs: 136 HP / 252 SpA / 120 Spe
Modest Nature
- Protect
- Ice Beam
- Surf
- Scald

Heliolisk (M) @ Focus Sash
Ability: Dry Skin
Level: 50
EVs: 104 HP / 200 SpA / 204 Spe
Calm Nature
- Charge Beam
- Parabolic Charge
- Thunder
- Grass Knot

Muk (F) @ Black Sludge
Ability: Poison Touch
Level: 50
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Minimize
- Stockpile
- Power-Up Punch
- Gunk Shot

Swampert-Mega (M) @ Swampertite
Ability: Swift Swim
Level: 50
EVs: 252 HP / 252 Atk
Adamant Nature
- Waterfall
- Ice Punch
- Earthquake
- Protect

Garchomp (M) @ Choice Scarf
Ability: Rough Skin
Level: 50
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Dragon Claw
- Shadow Claw
- Rock Slide

Sylveon (M) @ Leftovers
Ability: Pixilate
Level: 50
EVs: 252 HP / 252 SpA
Modest Nature
- Hyper Voice
- Calm Mind
- Hyper Beam
- Psyshock


I'd like to have some feedback please. I've run multiple ideas and different teams but I still seem to get beat easily often as well as out predicted.