I have an Aron that l caught not to long ago and he loves to headbutt my Flareon. I’m getting worried he’s going to seriously injure her so I built a “dummy” for him to spar with, but he got bored in minutes. I’ve separated them in the meantime. Someone told me it was possibly a display of dominance and suggested either get another male to spar with or to get a female to be his mate. Do you think either is a good idea or is there another solution?

Perhaps not a mate, as this may make him more aggressive (depending on his usual temperament), but a sparring partner is worth looking into. Consider something sturdy and calm to keep your aron grounded mentally while taking hits. Members of the makuhita line are a reasonable choice (despite the fact that it’s not armored). Likewise, beldum is an excellent choice, not only because of their natural armor but also because the telekinetic abilities their line eventually develops offers an additional way to keep your aron out of trouble. Really, though, any bulky or armored pokémon will do (short of rock-types, of course).

Best of luck!