[RATE MY TEAM] Tips on my VGC 15 Team

[Marcusube]

Swampert-Mega @ Swampertite
Ability: Swift Swim
Level: 50
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Protect
- Earthquake
- Waterfall
- Rock Slide

Politoed @ Eject Button
Ability: Drizzle
Level: 50
EVs: 252 HP / 108 Def / 40 SpA / 108 SpD
Calm Nature
- Scald
- Ice Beam
- Protect
- Helping Hand

Amoonguss @ Rocky Helmet
Ability: Effect Spore
Level: 50
EVs: 196 HP / 108 Def / 56 SpA / 148 SpD
Relaxed Nature
IVs: 0 Spe
- Rage Powder
- Giga Drain
- Protect
- Sludge Bomb

Bisharp @ Life Orb
Ability: Defiant
Level: 50
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Sucker Punch
- Knock Off
- Iron Head
- Protect

Thundurus-Therian @ Choice Scarf
Ability: Volt Absorb
Level: 50
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Thunder
- Volt Switch
- Hidden Power [Ice]
- Dark Pulse

Scrafty @ Lum Berry
Ability: Intimidate
Level: 50
EVs: 228 HP / 192 Atk / 88 Def
Brave Nature
IVs: 0 Spe
- Fake Out
- Knock Off
- Drain Punch
- Stone Edge

These Pokemon would make a good rain team in my opinion based off the core you have in mind. You can't disguise a rain team because if the opponent sees Politoed and Swampert, it is going to be their first assumption.