>>572185491: Rule of cool
2: Because it could really use the buff; it's outclassed by pretty much every other fire type/intimidate user otherwise and there being dozens of mons that outclass it in its role as a fire-type attacker
In singles it's at the second lowest usage tier and in doubles there is just absolutely no reason to use it ever when its hisuian form and Incineroar exist
3: Besides, there's plenty of non-dragons that get dragon dance anyways, so "it's not a dragon" isn't a meaningful reason