Interesting, Heatmor of all pokemon seems to get an exclusive move:
Fire Lash
The user strikes the target with a burning lash. This\nalso lowers the target’s Defense stat.
Fire
Physical
80 Power
100% Accuracy
15 PP
Adjacent Pokémon
-1 Defense for the target
Flags 0x49
Inferno Overdrive (160 Power)
It doesn't really help Heatmor, but it is interesting. Guess the idea is that its fire tongue acts as a whip.
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Then there is Burn Up:
Burn Up
To inflict massive damage, the user burns itself out.\nAfter using this move, the user will no longer be\nFire type.
Fire
Special
130 Power
100% Accuracy
5 PP
Adjacent Pokémon
Effect 397
Flags 0x448
Inferno Overdrive (195 Power)
Its learned by Arcanine (as an egg move), Moltres and the Typhlosion line. Moltres might benefit from being able to change its typing like that. But what type would a single type pokemon become after it is used, Normal?