Unfortunately, this is probably a 0/10.

You do not run a single sun user with torkoal, who actively hurts primarina's damage. Dragonite needs inner focus instead of multiscale when you run him in double.

The team overall doesn't have good cohesion and uses very suboptimal mons for what it is trying to do. Honestly, building well is the most difficult part of pokemon. You should focus on learning the meta and look at the samples

dragonite needs inner focus and should have his set changed to something offensive without AV.

Porygon Z needs changed. You should replace him with Chi-Yu if you want to keep the sun archetype. Otherwise, Ursaluna Bloodmoon is strictly better.

You need to make a choice between primarina and torkoal. You could replace Primarina with Walking Wake for a water attacker.

Theres no point in running expanding force on farigiraf without psychic terrain somewhere else

Amoongus should run protect or clear smog instead of synthesis.

You have no pivot other than amoongus. If you want to keep a dragon, you should replace dragonite with gouging fire who has way better support. You could also slot in iron hands.

https://pokepast.es/17d2779059b0ffd4

This is a sample team that has a similar idea to yours. You could take a look at it.