scald shouldn't be banned. i don't think they should try THAT hard to minimize luck from this game. it isn't as bad as swagger, shadow tag or geopass.
by this logic we may as well ban sacred fire cuz it has a
50% (well, 47,5%) chance to burn, i know entei is the only user of it but back in dpp and maybe even bw idk what kept them from testing Ho-Oh
- https://www.smogon.com/forums/threads/ho-oh-%E2%80%93-is-it-truly-an-uber.46794/ .i mean if for example i have a hippo and his CB Entei scores the burn, i now can't wall stuff reliably unless heal bell comes into play. even bulky waters can't wall stuff that reliably while taking 12% damage per turn (or 6% with lefties). and what about seed flare? shaymin runs Rest, Seed Flare, Earth Power, and one HP of choice (rock, fire or ice) in OU IIRC. So if I have a volca and his LO Shaymin scores the special defense drop, i can't set up or kill cuz volca dies to earth power. fire-types die to earth power or HP Rock if they switch into a seed flare and take a drop in special defense. let's ban seed flare I guess!
you can say that these moves are rare and only used by one or two pokemon... but back in bw, why did they ban brightpowder in round 3 or something, when chomp was the only practical user of it? and later in bw, sand veil was banned despite the fact that only chomp could abuse it???? was 80% ice beam that bad or am I missing something here?
about scald v lava plume, yes scald is way better considering most pokemon that are immune to burns (e. g. fire-types) are hit super-effectively by it, but unless it's coming from something such as specs keldeo (which is not very hard to prepare for tbh), said fire-type can usually take a hit and retaliate with solarbeam (zard y) or set up (zard x, volca, bulky talon). you can use natural cure absorbers (celebi and starmie come to mind) or a lum berry on your physical sweeper (chomp, dragonite). defensive-inclined teams can also use aromatherapy/heal bell. magic guard clefable (which is S Rank) /reuniclus uses most bulky waters as setup fodder.
compare that to swagger for example where most of its abusers are prankster mons (klefki, thundurus which could set up with NP as well, sableye) where you HAD to chance 50/50s, and when you considered the fact that most swag teams carried Ditto or an unaware mon, you couldn't try to apply offensive pressure with a lum berry mon (this applies to ubers as well! you couldn't use muk such as SD Groudon to beat it). shadow tag is literally satan cuz if you switch gothitelle into a key defensive pokemon that happens to be using recover or a non-damaging move, you may as well say gg at that point! while geopass is so hard to properly beat due to offensive pressure being nullified by memento + dual screens and the fact that espeon is immune to muk such as roar and taunt, not to mention the threat of unaware clefable. prankster thundurus with taunt (which is kinda rare tbh) is like the only good check to that strategy lol
then again i heard that UU is way more affected by this move than OU - " UU players can tell you how negatively it affects the tier; stall wars between bulky waters simply fishing for Scald burns are not ideal under any circumstances. " i kinda agree with this tbh even though I don't really play this tier, considering there are so many bulky waters down there (suicune, slowking, swampert, seismitoad, milotic, alomomola etc etc.). maybe it should be banned from UU but no opinion here.
however, if the main concern is that scald changes the outcome of many tournament battles, we may as well ban critical hits then.
TL;DR Scald shouldn't be banned imo. I don't think it's as bad as say, Swagger or GeoPass.