YEAH MAMOSWINE!
Ice + Ground is already great STAB and without a freaking Sand Veil Shark around he can do more damage!
YEAH MAMOSWINE!
Actually, I'd say the opposite.
Remember that the stats are half Garchomp-Era, and half without Chomp [Thus the metagame is not settled yet].
Why would Mamoswine be used more in the current meta, when there are even more Water types around?
It wouldn't.
That +17 in useage is to REVENGE KILL GARCHOMP. Give it July, and he'll probobly be -10 or something, maybe not quite back to where he was, but he won't be keeping his position.
... Not to mention Mamoswine is slow and also weak to VERY common types [Water, Fighting, Grass, Fire, and Steel [Ferro and Scizor] are all everywhere]
There's also better Offensive Grounds, such as Landlos, and there's better users of Ice attacks, such as Starmie [Although it dosen't get STAB, it makes up for that with coverage and slightly better BP + Accuracy than Mamo's Icicle Crash]
Not to mention Scizor, Conkeldurr and Azumarill are better priority users.
Speaking of:
63: Kingdra: 2.5410
64: Donphan: 2.4397
65: Azumarill : 2.4060
That's just wrong. Let's do a little Azu v the Top 10, with the following set:
Azumarill @ Choice Band
Adamant Nature
252 Atk / 248 HP / 4 Def / 4 Sp.Def
Waterfall
Aqua Jet
Superpower
Ice Punch
Other possible moves for the 4th slot: Toxic, Return
Vs Ferrothorn: Superpower OHKO's all but the most physically defensive Ferros [Who are then vunerable to Special attacks], Ferro cannot switch in to attempt to wall the Water-type attacks for fear of this on his obvious switch.
Tyranitar: Both Waterfall and Superpower OHKO
Scizor: Azumarill resists Bullet Punch, so would win a Choice-Locked Priority War. Can't beat Scizor itself, due to faster U-Turns.
Politoad: Dislikes Superpower. Some Azumarills also carry Toxic over Ice Punch. Rain boosts Azumarill's Water STABS to levels of power that Skarmory cannot wall Waterfalls.
Gliscor: Waterfall and Ice Punch. Poision Heal Gliscor cannot wall Aqua Jet indefinitly.
Latios: Ice Punch and the possible Toxic are both disliked. Return gets special mention here too.
Rotom-W: HATES Toxic. Cannot take Superpower lightly.
Excadrill: Aqua Jet OHKO
Thunderus: Aqua Jet does a number on it, especially in the rain. Which is better than Scizor and Conkeldurr can say.
Dragonite: Ice Punch and Toxic are again, both loathed by the Dragon.
So... Azumarill can OHKO 4 of the Top 10 [Notably, Sand Mainstays], cripple Rotom-W, Thunderus and Politoad, and cause Dragonite and Latios some worry as they switch in.
All with the same set.
USE AZUMARILL MORE.