Griffon the Brush-Off

Pinkie Pie and Rainbow Dash bond over playing pranks on the other ponies until Rainbow's old friend Gilda the Griffon shows up for a visit. Pinkie Pie, feeling left out, desperately wants to play with Rainbow again. She soon notices that Gilda doesn't just play pranks, but can be downright mean to the other ponies. Pinkie Pie sets up a party to test who exactly is Rainbow Dash's true friend.