Tapu FiniWaterFairy

Tapu Fini can utilize a Choice Scarf to act as a fast utility pivot, taking advantage of its solid defensive typing and access to useful support moves. Trick allows it to cripple defensive Pokemon by removing their item and locking them into a single move, while Moonblast provides a reliable Fairy-type STAB option for threatening Dragon-, Dark-, and Fighting-types. Scald gives Tapu Fini a consistent Water-type STAB attack with a chance to burn switch-ins, helping punish physical attackers and making it harder for them to freely enter the field. The final slot can be used for Taunt to prevent slower defensive Pokemon from recovering or setting hazards, or Calm Mind to give Tapu Fini the ability to take advantage of passive targets and potentially sweep after obtaining boosts. However, being locked into a move can be exploitable, and Tapu Fini may struggle to make progress against faster offensive threats or Pokemon that resist both of its STAB attacks.

Tapu Fini is bulky enough to pull off a Calm Mind set, with Surf and Moonblast working well as complementary STAB attacks, u can also try the Nature's Madness Brine Combination.

Surf is better than Scald, since Misty Terrain blocks burns, thus Surf's higher base power is superior, u could also go for a higher base power but risky Hydro pump.

Haze with Icium Z give Tapu Fini one chance to fully restore its health with Z-Haze, it also allows u to reset the stats of ur opponent at the same time.

Hidden Power Fire allows Tapu Fini to deal good damage to Ferrothorn, and it allows u to ohko a Non Choice-Band invested Atk and Speed Kartana.

Taunt is useful for shutting down recovery against bulky Pokemon such as Toxapex,Chansey Etc.

Sitrus is a reliable way to restore some health, but Iapapa Berry is a riskier alternative that restores more health when Tapu Fini reaches 25% of its HP. {I recommend Using Sitrus Berry}

The given EV spread ensures Tapu Fini outspeeds Base 45 mons with +Speed Nature.

Don't be too reckless with Tapu Fini switch-ins, because while it might be bulky, it has no consistent, reliable recovery.{Even with healing Items such as Iapapa/Sitrus Berry and Z-Haze}

Make sure to pack in resists for Electric, Grass, and Poison-type Pokemon, as these are the kind of Pokemon that can bust through Tapu Fini's bulk.

Great Core example for fini is Lando-Therian and Heatran,Lando can give the Electric Immunity while Heatran can resist and immune to grass and poison