Easy peasy. Dragging and Dropping a mon into your party from the PC advances it by 7 (this can be repeated quickly over and over). I advanced my frame from 1 to... 1948 in about 12 minutes that way. Then, you can let the inbattle advancements do it VERY quickly for you, but you kind of need to be using an emulator to be able to keep track of that. And finally, walking 128 steps advances your frame by the number of mons in your party.