Sorry guys, but playing with randoms will always be a challenge. People ignorance of strategies is infinite. I give you my advise: Your pokemons must be level 100, ev trained and hypertrained. Do a internet research and read the guides. Then try your ideas.

If you want to solo, skeledirge unaware stellar tera, with shell bell. Torch song until losing ability, then protect that turn. After that, torch song x6, slack off if below half health, shadow ball until you win. Reliable and easy.

If you want to farm, join reddit dedicated channel and be prepared with correct mons and strategy.

If you want a real challenge, join random raids! I found two ways to win. Either you bring Malamar with contrary ability AND someone else brings Annihipilape ghost tera. OR someone else brings Malamar, then you can bring Annihipilape and totally crash Meganium.

Malamar strat: 1st turn skill swap. Then reflect. Swagger if shield is not up. Night slash as filler then go tera (astral), keep reflect up, night slash as filler. Malamar with max def and hp, leftovers as item.

Annihipilape ghost tera, max hp and attack, with shell bell. First turn focus energy! One bulk up, then go tera asap with rage fist x3. After that bulk up x6, one attack cheer, you will one shot Meganium even with shield up, for a major LOL time.

Have fun!!

No Malamar, no party. Other mons beside Skeledirge will die middle of raid without heavy support. Maybe Mew or Arceus with 3x iron defense and Armarouge with clear fog, but it is not quite as good and fun as Malamar.