Since we probably aren't updating the VR with the DLC coming soon, I wanted to post some thoughts on some IMO underrated Pokes.
HArc is so good!!! I've been inspired to use it a lot lately as it's won 5/5 of the Regulation E VGC events, and I don't think it performs that much worse in DOU. It has pretty obvious problems - Lando-T being a main one - but this is not particularly hard to work around in the builder, and it brings incredibly positive matchups into other top tier Pokemon as well as the always useful Intimidate. It comfortably switches into Flutter, Ogerpon-Hearthflame, Tornadus, and Ninetales/Baxcalibur, and can pivot in on a ton more (mostly Fire-moves). CB Rock Slide is quite scary offensively in tandem with its Fire STAB and access to ESpeed is handy in endgames. I think people are focusing way too much on the negatives on this Mon. While teambuilding, I prefer more polarized matchups this gen as you can often Tera out of the negatives and you want as strong of an answer into the high damage Brokens (Flutter, Chi-Yu, Ogerpon) as possible.
Glimm has been picking up! I know that there's
a lot of historical Glimmora Enjoyers in SCL (me, bagel, eragon), so the relatively high SCL usage might be iffy, but it's seen quite a bit of success in DWCOP so far, notably going ~9-0 for Team Italy in pools. The opponent is usually scrambling to deal with it on lead, which often nets you quite a bit of tempo, free damage, and sometimes SR. Turns 1-2 of my
SCL game vs Actuarily today demonstrates this well - Glimm forces 2 switches on lead, gets up hazards, and trades for itself. As with Arcanine, Rock STAB is very scary in the current metagame with any other attack to pressure the steels. Having offensive Pokemon with Protect next to it (SpA Booster/Pixie Plate Flutter, LOrb Chi-Yu, Chien-Pao) can often net you a free turn to click Power Gem as the opponent tries to ignore Glimm.
Sinistcha is quite a unique support and has seen quite high usage in DWCOP, with 31 total between its forms. It enables a lot of quirky setup styles and high tempo gameplay on bulkier offenses, allowing you to forgo using Protect as much while you heal with Hospitality. It works extremely well as an Anti-TR mode, walling normal Ursaluna while being able to reverse the dimensions. I want to highlight a set from
Nails' LAIC team (i forgot who originally built it) as a possible direction for Sinistcha in DOU, as Matcha Gotcha is a really really overloaded move. I've been quite high on Will-O-Wisp in the current format and Sinistcha's STAB attack can have that on a spread healing move. The CM set leans into this as much as possible, giving you a ton of sustain while slowly pressuring opponents.