If possible, please repost with the whole team with the changes. It's a bit difficult to re-rate if you just post the changes. There are a multitude of teams in here
Oh boy, this looks like a weird team
This team looks like it can't decide if it wants to be Semi-Stall or Balance, and it ends up being a weird mix of both
It ends up being really weak to set-up sweepers, stuff like BD Azu, SD Sharp, SD Chomp, and the like
Something you can do to alleviate this issue is to run Endure Garchomp > Toxic Garchomp
Garchomp @ Rocky Helmet
Ability: Rough Skin
EVs: 240 HP / 176 Def / 92 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Dragon Tail
- Endure
Endure gives Chomp the ability to chip away more HP from a potential threat, while not detracting too much from standard TankChomp. This lets you revenge-kill any physical sweepers with Scizor much more easily. Essentially you only save him if you see a huge threat, otherwise you can use him as you always have.
Otherwise, you could consider running CM Clefable > Sylveon
Clefable @ Leftovers
Ability: Magic Guard/Unaware
EVs: 252 HP / 172 Def / 84 SpD
Calm Nature
- Calm Mind
- Moonblast
- Soft-Boiled/Moonlight
- Thunder Wave
Clefable is able to form two roles depending on what you need at the time, either an Unaware Wall or a Stallbreaker MG Set. EVs are standard for OU, but you should probably switch it up to whatever mon you want to wall better, since the threats Clef covers with this spread don't exist in the league. Soft-boiled and Moonlight is slashed because Softboiled is illegal with Unaware, but it's the better recovery move
With this change though, you end up loosing a reliable way to nail Scizor, so another change I'd recommend in tandem is to run Fire Blast > Thunder Wave on Slowbro.
Slowbro @ Leftovers
Ability: Regenerator
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Scald
- Psyshock
- Fire Blast
- Slack Off
This lets Slowbro nail Scizor harder. assuming you don't miss. Otherwise everything is the same
There really isn't any glaring issues outside what's been mentioned, pretty solid team altogether. Good luck for the league!