Training spots?

Lab C-1
It's better than Critical Error, trust me.

And it definitely caters to combo smash more.
My additions: A Night In The Forest (Kappas), Typhons, Himes (already been said), Homunculous (poor exp but great cash if you have a pet), Windraiders, Nightshadows, Octos (already been said), Evil Eyes, Cold Eyes, B-3 (Iron Mutaes), Mithril Mutaes (since you have a decent upwards range you might be able to hit the upper panels while attacking), and Peak.