If you played an Enemy Skill Only challenge, Chocobuckle dealing 9999 would be perfect, if only you would be allowed to equip Chocobo Lure to find a chocobo...

By the way, I don't think Chocobuckle is a pain to learn, but powering it up sure is. Well, you can get a turbo controller and give your chars 8 combos of Sneak Attack + Exit (Lv. 1), but it would probably still take weeks...