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).
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Use a Pokemon with the ability magma armor or flame body (Slugma's ability usually)
Slugma and Magcargo have magma armor in Stark Mountain after you've beaten the Elite Four. Camerupt also has magma armor. Magby, Magmar, Magmortar, Slugma and Magcargo have Flame Body. Camerupt doesn't have magma armor. He/she has solid rock
Pokemon with magma armor in team
No, unfortunately only the abilities Magma Armor and Flame Body halves the number of steps required to hatch an egg in Pokemon Emerald and afterward.
It takes 9,180 steps to hatch an Eevee egg. However, if you have a Pokemon in your party with either the ability Magma Armor or the ability Flame Body, it will take 4,590 steps.