Why not have all of them swapped with past gens to confuse the heck out of the current audience? Rarity suddenly behaves like a child and insists she is a princess, too. Rainbow Dash takes over her boutiques, daaaarling. Pinkie Pie bosses everyone around.
Somewhere in G3 land Minty is shocked to find Pinkie has become more hyper than her.
Then the rap battle happens, of course.