>>46783453https://en.wikipedia.org/wiki/Greg_Smithey"In The Original Buns of Steel, Smithey leads viewers through a series of exercises devoted to strengthening, tightening, toning, growing and shaping the buttocks, thighs and upper legs."
I'd imagine Steel types like Lucario would have very firm buttocks.
https://www.deviantart.com/apricolor/art/lucario-252180266