What would you add to my team and what do you think of it ?

Question

Sweeper (Garchomp) @ Dragonium Z
Ability: Rough Skin
EVs: 116 HP / 252 Atk / 140 Spe
Adamant Nature
- Earthquake
- Crunch
- Dragon Claw
- Poison Jab

Tapu Bulu @ Choice Scarf
Ability: Grassy Surge
EVs: 252 Atk / 252 Spe
Adamant Nature
- Superpower
- Horn Leech
- Nature's Madness
- Dazzling Gleam

Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 Def / 252 SpD
Quiet Nature
IVs: 0 Atk
- Protect
- Stealth Rock
- Flamethrower
- Toxic

Azumarill @ Sitrus Berry
Ability: Huge Power
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Belly Drum
- Aqua Jet
- Ice Punch
- Play Rough

Lopunny-Mega @ Lopunnite
Ability: Scrappy
Happiness: 0
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Heal Bell
- Power-Up Punch
- Fake Out
- High Jump Kick

Gardevoir @ Choice Scarf
Ability: Trace
EVs: 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Moonblast
- Will-O-Wisp
- Psychic
- Thunderbolt

Comments

What format?

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I mostly use this as a preety offensive team and the format is OU

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Swap Gardevoir for Tapu Lele. There is absolutely no justification for using Gardevoir in OU.

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What's wrong with gardevoir If you dont mind explaining ( they have the exact same typing and preety similar movesets)

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It's completely and wholly outclassed. Its attacks are substantially weaker than Tapu Lele's, and that's pretty much it. It is also slower and more frail.

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Ok anything I should add or tweak? Or is my team ok ?

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Some other points of interest:
- Offence teams should use more than one set-up sweeper. Only one is used on this team.
- Azumarill without Normalium Z is noticeably worse. You can swap Garchomp's item to Rocky Helmet or Leftovers to free the slot.
- Return completes Lopunny's perfect neutral coverage, and should not be forfeited for situational moves like Heal Bell and Power-Up Punch.
- On offensive Pokemon, use coverage moves to hit targets that wall your STAB attacks. Crunch, Poison Jab, Ice Punch and Thunderbolt don't fit this description where you've used them, and are therefore questionable choices (even though some account for defensive weaknesses).
Side note, the button to add a comment instead of an answer is on the bottom-right corner of your original post.

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While Tapu Lele should always be used over Gardevoir for any meta team, I'm not sure that it's the best choice for a team that uses Belly Drum Azumarill as a win condition since Psychic Terrain nullifies Azumarill's Aqua Jet. Even though there's a Tapu Bulu on the team as well to change the terrain, I would still imagine that you wouldn't want to risk being an awkward position where you want to sweep with Azumarill, but Psychic Terrain is up and you need Aqua Jet and you're forced to go into Tapu Bulu to change the terrain before finding another opportunity to set up. Speaking of Tapu Bulu, if Garchomp's being used as the main wallbreaker, having Grassy Terrain up might hinder its ability to perform its role due to the terrain weakening its Earthquake. I'm still trying to learn the meta, though, after being out of the loop for a while, so correct me if what I'm saying isn't as much of a concern as I think it is.

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All of the above is accurate; my bad for glossing over it above. Given Azumarill, you should probably drop Gardevoir altogether and use a different Pokemon -- preferably a set-up sweeper, since dual scarves are quite unnecessary given the existing speed on this team.
Upon revision, some other issues I also didn't notice before include:
- This is an offence team without entry hazards -- generally not ideal. Running Garchomp on offence means running SR on it; absolutely drop Poison Jab for the reasons described previously.
- Always max HP on defensive Pokemon like Heatran on this team. 252 Def / 252 SpD is never a good spread.

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252 Def / 252 SpD isn't good on Heatran, but it can be better than 252 HP on Pokemon like Chansey or Hariyama that already have a lot of HP. Also Heatran has stealth rock.

Answer 1

Now, there are a few flaws with this team. The most obvious of which is your gardevoir, everyone's favorite waifu. Now, choice scarf with will-o-wisp. That doesn't work. Like at all. Dugtrio, or any other pokemon with arena trap, can switch in after a will-o-wisp, and demolish gardevoir. This is a similar thing with tapu bulu. Nature's madness will never knock anything out, so if tapu bulu's your last one left, and it's locked in, say goodbye to that match.
More subtle, but still important flaws are that on most of your sets, you only have 504 EVs set up, when you could have four more. I know this isn't that big of a deal, but i had to address it.
Now as for garchomp, you should replace crunch for hone claws, and dragon claw for dragon rush. Normal garchomp's bulky enough to take a hit, so do hone claws + dragon rush. Also, ice types shut you down. so run brick braek or iron tail. iron tail gets boosted to 100 accuracy after hone claws, so i would do that. Ferrothorn shuts down azumarill. This is the last thing, but run drain punch on it for ferrothorn and co.
Overall, though this is a decent team, full of decent pokemon.

Comments

When was the last time you really played OU? I kind of want you to find the details for yourself, so I'll just tell you that the metagame changed back in 2017 (yes that was 2 years ago), and Dugtrio has been unable to counter Gardevoir ever since.

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I don't specifically mean dugtrio. The last time i opened my DSi was when everybody was raving about black and white, i'm making a return and trying to find out what i missed

p.s i'm writing this from a kindle paperwhite in china.

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In that case, maybe you should play some more OU before trying to rate any OU teams.

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i did play some matches on showdown, and still... i tried this out and i was swept by an articuno.

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In that case, I don't think it's a problem with the team. You probably need to try harder to use stealth rock and keep Heatran alive.