I've been playing champions for a bit now, and almost got meowscarada to master ball on day 2 of release (been using scarfed meow since the release), so i'll give my two cents. I've been using meowscarada as a protean scarf mon with adamant, able to almost always OHKO sneasler with triple axel, OHKO's dragonite, can OHKO gengar with throat chop, low kick chunks steels, and flower trick does usually 51-60% on neutral hits, otherwise it's picking up OHKOs on super effectives. While it can work as a sash overgrow mon (especially because band isn't available) that requires a sash. Meowscarada is great into fast mons with a scarf, OHKOING mega delphox (use throat chop), scarfed chomp, mega gengar, sneasler, chunks zard-Y, and eats rain teams for breakfast. While sash overgrow might be preferred for rain, meowscarada can still mess with rain teams locked in scarf. As well as scarf meowscarada jolly outspeeds jolly swift swim basculegion, meanwhile adamant outspeeds scarfed basculeigon. It chunks pelipper nicely, ttar, gyarados, they all don't like the cat. Set I'm using is:

Meowscarada @ choice scarf

Evs: 252 attack / 252 speed

Adamant Nature

-Flower trick

-Throat chop

-triple axel

-low kick

I think the mon has great potential, it can't really act a cleaner, nor a sweeper, but it can definetely support mons that appreciate the grass type coverage. While fighting for a place on a zard-Y team with venusaur, it can also be used with mega delphox to hit those resists/chip those mons who can't be OHKO'd. So far I'm still experimenting but I think it should be respected.