Well, no, not really. At Lv 62 Emboar learns Flare Blitz. It's 120 Base Power, which is the same as the most powerful Heat Crash. It also does consistent damage, while Heat Crash's power will fluctuate. However, Flare Blitz can only be learned at a high level, and for most of the game you will have Heat Crash.
In-game, Heat Crash does just fine. My Emboar had Heat Crash and he obliterated. But, if you want a move with a consistently higher base power, then Flare Blitz is technically the strongest move Emboar can learn.