#208.274
Steelix/Mamoswine
208.274
#274.208
Mamoswine/Steelix
274.208

86(-12)
HP
98(+12)
115(+15)
ATK
100(-15)
120(-40)
DEF
160(+40)
60(-5)
SP.ATK
65(+5)
63(+2)
SP.DEF
61(-2)
63(+17)
SPEED
46(-17)
507(-23)
TOTAL
530(+23)

Regular
Reg.
Oblivious: Immune to Infatuation and Taunt.
Snow Cloak: During hail, has 1.25x evasion and doesn't take hail damage.
Sturdy: Can't be 1-hit KO'd at full HP.
Rock Head: Doesn't take recoil damage.
Hidden
HA
Thick Fat: Takes 0.5x damage from Fire and Ice-type moves.
Sheer Force: Effect chance moves have 1.3x power but lose the effect.

x2
FightingFireGroundWater
FightingFireGrassSteelWater
x1
DarkGhostGrassIce
BugDarkDragonFairyFlyingGhostGroundIceNormalPsychicRock
x0.5
BugDragonFairyFlyingNormalPsychicSteel
Poison
x0.25
Rock
-
x0
ElectricPoison
Electric

#95
Onix
95
Metal Coat
or Lv.40
#208
Steelix
208
#95
Onix
95
Metal Coat
or Lv.40
#208
Steelix
208
#220
Swinub
220
Lv.33
#221
Piloswine
221
Lv. + Ancient Power
#274
Mamoswine
274
#220
Swinub
220
Lv.33
#221
Piloswine
221
Lv. + Ancient Power
#274
Mamoswine
274

Mt. Mortar (static), Mt. Moon, Mt. Silver, Rock Tunnel, Union Cave, Victory Road
Pokemon: 95
Mt. Silver, Mt. Silver Base, Union Cave, Victory Road, Evolve Onix (Lv40 or Metal Coat)
Pokemon: 208
Ice Cavern, Seafoam Islands
Pokemon: 220
Ice Cavern, Ice Mountains, Evolve Swinub (Lv33)
Pokemon: 221
Evolve Piloswine (Learns Ancient Power @ Lv1)
Pokemon: 274