Rate my Team please

[UndeadMarowak]

I got wiped out last night in rated VGC battles. I would really appreciate some help on how to better my team. I try really hard to use Pokémon I like only, so you won’t see Rotom Wash or Landorous on my team cause I don’t really like them. I haven’t done much competitive battles since RSE, so my knowledge of the meta is limited to my hours watching YouTube VGC and WiFi battles. I feel like my team does much better in 6v6 format than the 3v3 VGC cause I haven’t lost a 6v6 WiFi battle yet


Raikou @ Air Balloon
Ability: Pressure
EVs: 252 SpA / 252 Spe
Timid Nature
- Thunder
- Volt Switch
- Shadow Ball
- Hidden Power(Ice)

Regice @ Icium Z
Ability: Clear Body
EVs: 252 HP / 252 SpA
Calm Nature
- Blizzard
- Thunderbolt
- Hail
- Thunder Wave

Hippowdon (M) @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 252 SpD
Sassy Nature
- Earthquake
- Slack Off
- Toxic
- Stealth Rock

Machamp (M) @ Assault Vest
Ability: No Guard
EVs: 252 HP / 252 Atk
Adamant Nature
- Dynamic Punch
- Bullet Punch
- Stone Edge
- Knock Off

Barbaracle (M) @ Focus Sash
Ability: Tough Claws
EVs: 252 Atk / 252 Spe
Adamant Nature
- Shell Smash
- Razor Shell
- Earthquake
- Rock Slide

Chandelure (M) @ Grassium Z
Ability: Flash Fire
EVs: 252 SpA / 252 Spe
Modest Nature
- Fire Blast
- Energy Ball
- Shadow Ball
- Will-O-Wisp