Multiple reasons why some of the main is that they are from the same egg group and can mate as well as both evolve from happiness thus if a rilou and bunneary grew to love each other and become happy they would evolve. Makes for a sweet story as well as both being humanoids it looks aesthetically pleasing.
Or, People just think Lucario and Lopunny look like they r made for each other.... Or something like that. That is what i think.
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Consider what it looks like along with it's type for inspiration. Here's a couple: Roario, Lu, Luca.
They are from the canine family, they growl alot like dogs do. Pokemon Master & Lucario Biologist ~Bolt the lucario
Lucario have the ability to swim! They like to take a nice swim once in awhile to, clean our fur and reboot their aura abilies. Hope it Helped! Pokemon Master & Lucario biologist ~Bolt the lucario
Infernape is in the Field and Human-Like egg groups, which means it can breed with compatible Pokemon in those groups. Some examples of Pokemon that can breed with Infernape include Lucario, Blaziken, and Machamp. When breeding Infernape, it is important to consider factors such as Egg Moves, Abilities, and IVs to potentially produce stronger offspring.
The best place to train a lvl 20-30 Lucario is up by Snowpoint city. Fighting types like him are really good there.