How to unlock Mamoswine
Getting Mamoswine means pulling the Sinnoh banner and hitting its 4★ slot. The 4★ band takes 6.5% of all pulls and holds 211 partners, so one specific Mamoswine works out to about 0.0308% per draw. The 70-pull pity counter only applies to 5★ results, so Mamoswine has no floor of its own and no targeted pull. A duplicate Mamoswine refunds 120 coins at the 4★ rate.
Mamoswine stats and rank
Mamoswine carries 120 HP, 112 speed, a ×1.42 attack multiplier, ×1.42 physical, ×1.08 special, 80 defense and 60 special defense, 530 in total. On the three-stat percentile this is 83.1 out of 100, which puts Mamoswine at rank 50 of 966 and in tier S. What separates it from its neighbours is shape, not size: its strongest slot is physical multiplier (94th percentile) and its weakest is special defense (37th percentile), so it is a specialist rather than an all-rounder.
Best moves in Mamoswine's pool
At move level 5 the pool is led by Body Slam at 75.6 damage per 0.71s (150.7 effective DPS, ×1.42 multiplier), then Tackle at 33.6 damage per 0.38s (127.2 effective DPS, ×1.42 multiplier), then Quick Attack at 44.8 damage per 0.56s (113.1 effective DPS, ×1.42 multiplier). 11 of its 18 damaging moves scale with the physical multiplier and 7 with the special one, alongside 4 support moves. Its physical multiplier is the higher of the two (×1.42 against ×1.08), so physical moves convert better. The top option beats the second by 23.4 DPS, which decides slot one and leaves slot two as a judgement call.
Evolution cards for Mamoswine
Its starting move, Ice Beam, evolves into Blizzard once the move is at level 5 and you hold the Power card, which boosts attack for that run. A level 5 move without Power in the run is still just a level 5 move. 18 of its 22 moves carry an evolution card, across 5 distinct cards (Vigor, Sprint, Power, Reflexes and Armor). The strongest of them is Body Slam at 150.7 effective DPS, so that is the one worth holding a card for first.
Mamoswine compared to similar partners
The two closest stat lines in the roster are Urshifu (-5 HP, +7 speed, same attack multiplier, +20 total) and Bewear (+4 HP, -9 speed, -0.03 attack, -30 total). Against Urshifu, Urshifu is 7 speed faster and the two carry an identical ×1.42 attack multiplier, and the rank gap is 22 places. The exchange rate is the point: nothing here improves on both lines at once, so neither side is a strict upgrade and the move pools have to break the tie.