SS OU Hello, I need help to improve my team

[Lunar_muffin]

Hello, I would like you to advise me on how I can improve my Pokemon team, they have beaten me a few times, although I do not know if it is rather lack of practice.
Chubby_bunny (Cinderace) (F) @ Heavy-Duty Boots Ability: Blaze Shiny: Yes EVs: 252 Atk / 4 SpD / 252 Spe Jolly Nature
- U-turn
- High Jump Kick
- Pyro Ball
- Iron Head
Shuckle (F) @ Leftovers Ability: Sturdy Shiny: Yes EVs: 252 HP / 4 Def / 252 SpD Sassy Nature IVs: 0 Atk
- Stealth Rock
- Toxic
- Infestation
- Sticky Web
Mandibuzz (F) @ Rocky Helmet Ability: Big Pecks EVs: 252 HP / 252 Def / 4 SpD Relaxed Nature
- Defog
- Roost
- U-turn
- Foul Play
Rotom-Mow @ Life Orb Ability: Levitate EVs: 252 HP / 4 SpD / 252 Spe Timid Nature IVs: 0 Atk
- Leaf Storm
- Nasty Plot
- Volt Switch
- Dark Pulse
Alcremie (F) @ Iapapa Berry Ability: Aroma Veil EVs: 252 HP / 252 Def / 4 SpA Modest Nature IVs: 0 Atk
- Mystical Fire
- Calm Mind
- Dazzling Gleam
- Recover
Dugtrio-Alola @ Focus Sash Ability: Tangling Hair EVs: 252 Atk / 252 Spe Jolly Nature
- Sucker Punch
- Hone Claws
- Earthquake
- Iron Head

 

[TPP]

Welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide at least 3 lines of 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. If you need help with the explanations, you can visit the smogon dex and read the analysis for each pokemon.