Please expect a response to this in three days' time. It needs to be discussed with the dev team.I looked back a couple pages and didn't see any discourse on this subject, so apologies if this has already been justified somewhere, but I'd like to make a petition for Cosmic Power sets to be removed or nerfed.
My main argument is that you can get into situations where there is simply no counter play besides praying for a super- effective STAB crit, and even then with how bulky some mons like Deoxys-D are, they could still even survive a crit and recover back to full (I haven't done the full math on that one so take that claim with a grain of salt). Obvious potential conterplays are CC (para, sleep, Encore), forced swap, 100% crit moves, or Haze, but you can easily end up with teams that don't have these options, and I don't think the random battles algorithm enforces counters (if one team has Cosmic Power, ensure the opposing team has at least one of X options).
I understand opposing view points will probably say "sometimes you just get unlucky, that's Random Battles in a nutshell", and while bad luck is inevitable and will often cost you games, at least games where you have bad luck but still had options to try and out play your opponent can still be fun. I can't say I've ever played a match against where either myself or my opponent had a Cosmic Power mon, had that mon sweep the game, and felt like it was a fun match.
Case in point here: https://replay.pokemonshowdown.com/gen9randombattle-2252465688-ysz6gfuagidype27i0lwdun0b2t5ia1pw
Appreciate anyone open to constructive discourse on this subject. Thanks!
Please do not purposefully express intent to wait out the timer in battle for the express purpose of angering your opponent.