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Deals damage. The power of this move depends on (user's weight / target's weight), rounded down. Power is equal to 120 if the result is 5 or more, 100 if 4, 80 if 3, 60 if 2, and 40 if 1 or less.
Emboar is a heavy Pokemon, but it's not quite heavy enough to utilize this attack well. It's only hitting a few Pokemon for that full 120 Base Power, while in return, it's smacking a large number of Steel-types for pitiful damage. Stick with the far more consistent Flare Blitz.
Fire Punch is a more reliable alternative that generally obtains a higher average Base Power for lighter users.
Flare Blitz is a more reliable alternative that will always be equal to or greater than Heat Crash in strength, but deals recoil damage to the holder.
Heavy Slam is a Steel-type equivalent.