What's a bad pokemon with great abilities

I just randomly found out that Feebas has Oblivious, Swift Swim, and Adaptability... three abilities that I would kill to have on Milotic. Its abilites are already very good, but why does Feebas have to go this hard if it doesn't even keep them upon evolving?

The other one that comes to mind for me is Pyroar having moxie with 68 base attack.

Maybe I just don't know ball, but does Liepard even reliably take advantage of Prankster?

Put these Pokemon next to the others that learn these abilities and they stick out like a sore thumb to me.