this is a really easy way to get it: watch the fight @ memory's skyscraper, then go back to the alley to between. it has to be in battle, so go out to fragment crossing and drive. if you're not in final form, go back to alley to between's save point and jump to the world map. continue until you get final form. a good thing that i utilized was the fact that the alley to between was a "conversation pit" where you have no party and your drive bar resets if you go in in drive mode. i just stepped out, drove, came back, and repeated a whole lot until i got it. i don't know when alley to between stops being a conversation pit, but it does, so do it right after memory's skyscraper. this whole process took about 5 minutes to complete (mostly due to the fact that i didn't activate a battle until the last 2-3 times i tried).