I'd assume not, I've never heard of it
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You can not get an Armor Fossil in HeartGold.
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
It was given out at the 2009 medieval party for finishing the quest.
first beat elite four and go on maps then u will find golden Pokemon