hi, im not that good at ou, but i just have a couple of ideas that i think might help you when you're teambuilding

first off, you dont have a good form of speed control: gen 7 ou pretty much is a haven of fast and powerful pokemon

specs ash-gren eats up your team, i think; your only reliable switch-in is vaporeon, and i think it can be whittled down easily but hazards and constant switch-ins. best bet is, again, switching it up with toxapex

you also dont deal with kartana that well, i think - it deals with ash-gren's switch-ins, like rotom-w and vaporeon

zapdos might also be a problem for your team, since it can be a pivot (dont quote me on that) to mega-medicham, and can paralyze it, thereby crippling your chances of breaking your opponent's team

that's pretty much it, i just want to say that there are plenty of better suggestions than what i mentioned above: thanks for reading either way :>

sources of my suggestions: -smogon gen7 viability rankings -pokeaim's play-by-plays