hi, would like to revisit this since it's been a few months. i've laddered quite a bit yesterday with froslass hail and i'm convinced that snow cloak should be banned beyond speculation that it can be effectively abused.
this is the main froslass team i used:
https://pokepast.es/2ca49690d3ef3653
azelf: starts the offense, spreads para, gets up, and attempts to boom on ttar/a steel. hitting ttar can pay off huge dividends, hence the max atk, and guarantee permahail early in the game
gyarados: broken sweeper you can use before you set hail, continue the paraspread and break early. can force metagross's hand and provides strong defensive utility
latias: lum healing wish set with twave and hp fire to hit steels like meta/sciz and also pack loom coverage
aboma: fling light ball, which often targets steels for froslass. offensive to threaten clef and break skarm with blizzard. eq an a different item, like focus sash, can be considered on aboma over fling + light ball
froslass: sub twave cray ice beam with power and enough hp to sub 5 times from full. while swagger would have made this more busted, confuse ray still excels against phys offense in particular, which is one of the most effective styles in current meta
machamp: abuses froslass twave + cray and gets easy entrances, turns the tides on ttar, helps to break fat with healing wish support. machamp in hail is a huge nuisance too, bc skarm jira etc have a harder time switching in
combining froslass, machamp, and abomasnow on an offensive team gives a lot of disruption and maximizes the mu fish/hax abusing elements of each pokemon. it's difficult enough to account for the large variety of azelf teams in current dpp. adding this hail offense to the mix and having to account for snow cloak dodges, confusion hax, and pure bullshit makes things much more unpleasant. i encourage everyone to try this team for themselves and see if they think snow cloak is bad enough to not warrant tiering action.
here are some example replays showing the team in action:
https://replay.pokemonshowdown.com/gen4ou-2007627290-k0a3rqy7phvw49a1yfi58xhaoj46tcepw - vs johnnyg2 who was on a 24-0 streak. he loaded a sashloom sandless offense team style, which was used this past spl finals, and lost to froslass on the spot. you will see tons of paras, confusion hax, and a fire blast dodge as froslass spams sub and twave soloing the whole team. johnny's team wasn't bad, but happened to land a rough matchup. froslass's speed, access to confuse ray, ability to abuse hail, and to further this with snow cloak giving it potential setup out of thin air can excel strongly against offenses that don't have non-scarfers to outspeed lass.
https://replay.pokemonshowdown.com/gen4ou-2007624411-zp8myedn815qib05qgzlnrl1ek0cgfspw - vs mbh, dpp ladderer who has had high peaks and played for a long time. this game shows the team's strengths outside of lass cheese potential, against bulky offense (anti's week 1 spl team)
https://replay.pokemonshowdown.com/gen4ou-2007534170-5lphgu2iufwq3yu33hzk63fbs207ynopw - vs cubic skunk, froslass gets easy entry into a mach punch to rkill azelf, and cubic tries to spore the lass assuming it's spikes (+ icy wind). after subbing up (which it could easily get by threatening ice beam), tyranitar enters and proceeds to be 1v1d in sand, prompting a forfeit
others:
https://replay.pokemonshowdown.com/gen4ou-2007471244-viuu77m64452bq3hxazqeokl7agluw2pw - shows lass ability to clean endgames vs weatherless offense (i believe this was in le don's teamdump?) froslass defensive profile walls non-bp luc (the most common), and twave + sub combo gives very strong odds for lass endgame, prompting a forfeit
https://replay.pokemonshowdown.com/gen4ou-2007473563-kw70jcgd3mhxc4qj3rw0yrbfvsbfyxzpw - same guy, using aero ho, froslass pivots into espeed under hail, and forces ttar line. froslass breaks infernape and cripples ttar enough lategame for aboma clean
https://replay.pokemonshowdown.com/gen4ou-2007526724-s6vczweohjldxir97k6vnmc3g69rxp8pw - froslass dodges breloom leech seed and cleans 4 pkmn
https://replay.pokemonshowdown.com/gen4ou-2007677874-7hvnxhxn6rjf87jx2xslmwnwepbrencpw - didn't play great, but this shows that machamp + azelf can force tyranitar's hand early quite often. froslass put in work against bkc's old screens offense
other potential cheese froslass sets: ominous wind > cray, spikes > cray, mud slap + protect on a tspikes-based team, etc.
obviously this team has its flaws, but i think enough evidence is shown here to point at froslass cheese having the capability to cheese an spl game. although there weren't a lot of snow cloak dodges in these replays, this was just one day of laddering. it's evident from these replays that snow cloak dodges can exacerbate and add more rng to an already unpleasant and viable strategy.
additionally, there are more defensive types of froslass cheese that have been used over the years and still have a lot of potential (osgoode's mud slap froslass tspikes team which was built recently:
https://pokepast.es/b215675a0e5427de, emeral's aboma lass defensive paraspam, etc). if the community's viewpoint is that it wants to see sub twave froslass win a game in spl first with good faith reasoning, then so be it. personally, i think snow cloak should be banned before spl for the following reasons:
1. snow cloak is effective enough to be loaded in spl and utilize evasion to take the game out of a player's hands
2. banning snow cloak is largely inconsequential outside of losing froslass, which is not a huge deal. you can claim its niche as a suicide spiker but, let's be real, the pkmn rly isn't great and has a lot of problems compared to skarmory in this role
3. snow cloak cheese is versatile, finding a place on both offensive and defensive teams