Any changes I should make?

Question

This team almost always works for rotation battles, but should I change anything?

Jumpluff @ Sky Plate
Ability: Leaf Guard
EVs: 296 HP / 140 SpA / 244 SpD
Adamant Nature
- Dazzling Gleam
- Bounce
- Acrobatics
- Giga Drain

Aromatisse @ Pixie Plate
Ability: Healer
EVs: 350 HP / 222 SpA / 201 SpD
Bashful Nature
- Dazzling Gleam
- Psychic
- Flash Cannon
- Moonblast

Erick (Hydreigon) @ Draco Plate
Ability: Levitate
EVs: 336 HP / 289 SpA / 229 SpD
Sassy Nature
- Surf
- Dragon Rush
- Incinerate
- Fly

Meowstic @ Spooky Plate
Ability: Keen Eye
EVs: 316 HP / 195 SpA / 174 SpD
Naughty Nature
- Thunderbolt
- Shadow Ball
- Psychic
- Toxic

Comments

Your EVs are all over the place. I think you have confused them for your Pokémon’s actual stats. Your natures are also very suboptimal.
Did you breed these Pokémon specifically for competitive play? If you didn’t, there lies your most important advice: breeding fit-for-purpose Pokémon is absolutely necessary, and a standard if you are playing against other people. Even if you aren’t, it’s the biggest improvement you could make.

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A lot of these Pokemon are really confusing. Why run the type plates instead of Life Orb? Why is Jumpluff running an offensive set instead of a typical support set? Why Fly and Incinerate on Hydreigon? Why the suboptimal nature?

In general, all of Fizz's comments are spot on. You really, really have to breed Pokemon to make them fit for competitive play. I'm sorry if it sounds harsh.