there is the obvious one which is doing something like, only completing the Hp spheres on the sphere grid or only completing the first circle on the grid. dont train your peeps/dont collect celstrial weapons/dont collect the secret aeons etc....
(i doubt it is posible if you do the above but try to beat the dark aeons)
just rembered you need to break the Hp limit to do so,so not posible)
i hope these idea helped you think of something ultima shadow