I hit master ball tier (1700 rating) with this team after stuck between ultra ball 1-2 for some time with my sun team.

I tried to squeeze as many types as I could so I could have more synergy and don't be hard countered as before.

I think that the team isn't fully optimised yet, so I need some advice.

What I can improve to compete better in master ball tier?

The team is not build around a specific combo and doesn't have a core, it's just a balanced crew with answers depending what I have against me, but I don't think this is enough in master ball tier as the teams are more polished and players make better decisions.

I have some ideas and I want some input if they are valid or not.

I am considering to swap brave bird from corviknight, it was there only for something to hit the ghosts, and mewscarada as I see that often. I think iron head is better as only venusaur can hit fairies ATM but at the same time I consider changing the ev's too. I think 90 speed and 110 attack by dropping some hp, maybe make a difference with a second attacking move or maybe keep it as it is and go back to U-turn.

Venusaur stats are like this because while keeping the odd number for hp, I think 118 speed is mandatory to outspeed base unboosted 100's and 160 sp. attack pre mega, is good enough for one shotting uninvested Pokémon.

I think leech seed (it's there to force swaps) should go with protect but then it's a different role.

I don't want to drop earth power, so sleep powder should be better?

Garchomp has choice scarf because I use it mainly as a revenge killer, that's why it has four attacking moves.

Still it's there to counter archaludon, mega dragonite and charizard X, as I don't have another answer to them.

I made rotom a special sweeper because the team lacked damage. Should I revert it to a more bulkier role? If not, should I give him another item than magnet? Magnet is there to have a slight edge against opposing rotom wash.

Mimikyu and incineroar are fine as they are, I think.

Any advice is welcome, I don't mind swapping Pokémon, natures, ev's, items and moves. If I can polish this team and compete with it, I'll be happy.

If I have to change everything and go for a specific combo or meta counter to compete, so be it.

Just need some insight.

Need criticism for master ball tier.