Meowscarada would have been pretty broken, had it existed a single generation earlier. However, SV brought a nerf to the ability Protean; the user now only changes type once after switching in, and must switch out and back in for Protean to activate again. It's still a fantastic ability, but not exactly a broken one.
Meowscarada @ Choice Band
Jolly - Protean
252 Attack, 252 Speed, 4 Defense
Tera Type: Dark / Grass
-Low Kick / Play Rough / Thunder Punch / Sucker Punch
Despite Protean's nerf, Meowscarada is still a difficult Pokemon for many teams to switch into. Grass/Dark, while terrible defensively, is not horrible offensively, especially when backed up with Protean-boosted U-Turn and coverage moves such as Low Kick.
Flower Trick is Meowscarada's signature move; it's a 70 base power move that never misses and always crits. Effectively a 105 base power move that can't miss and ignores boosts to the opponent's Defense and drops to the user's Attack for most purposes. This is quite strong, and makes up for Meowscarada's somewhat timid base 110 Attack, which is good but pales in comparison to some of the monsters it finds itself competing with in SV.
Knock Off had its distribution gutted in SV, and Meowscarada is one of fairly few Pokemon who gets the move now. It's still just as good as ever, but now even more valuable with fewer users.
U-Turn synergizes very well with a Choice Band set, being essentially unaffected by the Protean nerf on Choice-locked Pokemon and allowing you to scout opposing switches and deal some pretty serious chip damage thanks to getting STAB from Protean.
The last slot usually goes to Low Kick, which hits most Steel and Dark-type opponents like Ferrothorn, Kingambit, and Iron Treads hard. Play Rough hits a couple notable targets like Roaring Moon and Grimmsnarl harder, while Thunder Punch specifically targets Corviknight. Sucker Punch can be used to deal some serious damage to the handful of faster threats such as Dragapult, Iron Bundle, and Flutter Mane, as well as Scarf users.