you cant they get it by the body trait
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In battle, the ability Magma Armor prevents freezing. Outside of battle, if the Pokemon with Magma Armor and an egg are in the party, Magma Armor will halve the number of steps required for an egg to hatch.The following Pokemon have Magma Armor: Slugma (dual ability with Flame Body), Magcargo (dual ability with Flame Body) and Camerupt (dual ability with Solid Rock).
Pokemon with magma armor in team
Pokemon Emerald, Ruby, and Saphire.
Team Magma boss Maxie in their hideout in the cave by Lilicove's shore
Judged Pass