>>26651792>>26651907Cube doesn't have a way to break through shit like Ferrothorn with physically oriented sets. Icicle Crash grants it the ability to run Scarf/Band/Physical(-Mix) LO and break a lot of walls it couldn't break before. Crash/Bolt/Earth Power/Roost as a set by itself would be enough to but Cube in Ubers.
>>26651991>>26652035You asked.
Cube isn't hard countered by anything other than Defensive Mega Scizor, but its effectively countered by every one of its sets having a good number of counters and 20+ checks. Cube has difficulty switching in, dealing meaningful damage, and still surviving. Ferrothorn and Chansey (yes, Chansey counters something with 170 Attack) are effective counters since they can beat the sets that cube pulls off most effectively. they don't beat Specs or Band (respectively), but that doesn't really matter since those sets have many more counters than mixed roost kyurem.
Lugia's been discussed and rejected quite often considering it'd have near 100% usage since it's viable on every team type and has no downside to use, any stall mirror becomes whos Lugia falls first, etc.
I've never seen Yveltal talked about since it shreds through the tier effortlessly. Clef and Diancie Counter, TTar and Klefki check, but unlike Cube... that's pretty much the list. Yes, there's stuff that can revenge Yveltal (you can revenge Mega Ray even as low as NU), but nothing else in the tier can actually touch it. Every single Cube set has at least as many counters and ten times as many checks as Yveltal does, and that's ONE Yveltal set. Your counters might not even apply to other sets!
Giratina was actually tested! Even if it was a joke. We saw the meta with Giratina in it. It wasn't THAT broken, and it was kinda interesting. It was still clearly above the power level of everything in the tier (and this was when there were less bans/higher power level in OU), but it was an interesting ladder to play.