Boundaries Crossed Ditto let's you play a basic over it. It didn't let you evolve into a stage 1.ditto is a weaker version of black and white one, it doesnt allow you to evolve turn 1, or on the turn it comes into play, so pretty much its a very weak basic that subject to immediately free- prized by an opponent and it only works if the stage 1 is in your hand.
kahili is not even that good, compared to even tierno, or hau? why would you use it over shauna, cynthia or sycamore.