Kyurem runs a mixed set quite effectively, because of its high 130 offensive stats. On the other hand Victini more or less has to choose between physical and special, since 100 offensives are kinda lacking without heavy investment (for a wallbreaker)
While 100 in both offenses seem underwhelming at first glance, what makes Victini so amazing in wallbreaking is not its stats but its movepool. 100 offense is not bad when you have a whooping 180 BP STAB move in V-Create that 2HKOs half the tier, and most of the other half is taken care by a 130 BP coverage move in Bolt Strike. More importantly The most common things that wall it might be Water /Grounds and Rock/Grounds, but a glance at Victini's movepool will reveal that it also has access to Grass Knot and Energy Ball - which, coincidentally, are 4x effective against most of those who walls Victini in its physical spectrum. With small investment (just give it a neutral nature) you can 2HKO most of those with either move. While it might still be walled by Dragon/Grounds (which is just Flygon now) with this coverage, it can always just U-turn out to an appropiate answer, or it can simply run Glaciate on its last moveslot to kill Flygon itself. Moreover, thanks to its ability, all of its move that it needs have over 90 accuracy making them very reliable. The reason why Victini is a good wallbreaker is because its moves have high power and cover almost the entire tier while worst comes to worst it can U-turn out.
The problem with Kyurem is that its coverage is nowhere as good as Victini's and while it has better stats, its moves at most only reach 90BP sans Draco Meteor, Blizzard and Focus Blast, the former one hugely hampers its firepower after using it and the later two have horrible accuracy (and locking in Outrage proves to be deadly as it means free Aggron/Florges switch in). Ice/Ground might seem decent at first, and you can run Iron Head to waste Florges, the prime Special Wall of UU, but bulky Waters will still wall you, most notably Alomomola who can Mirror Coat the damage back and Blastoise who can fire back an Aura Sphere. Porygon2 and Umbreon don't care about Kyurem unless it packs Focus Blast or Outrage. Bug/Steels, mainly AV Escavalier, don't care Kyurem's unSTABed Earth Power and can hit hard back with an SE Steel STAB. Bronzong, one of the most popular Trick Room setters, don't care about Kyurem and can setup TR in its face without worry and can use Gyro Ball to break its sub. The lack of a pivot move also makes it less ideal. Its ability, Pressure, does not help it offensively (Don't get me wrong, it is still a good ability defensively that makes Kyurem less easily revenge killed by Sub stalling out low PP moves). Luckily it has reliable recovery in Roost and above average bulk that allows it to increase its longevity over Victini.
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