I imagine this takes place in some sort of truce AU where they are all friends/forced to live together or something ~
Misty is growing tired of Jessie's appalling eating habits, which have been taking their toll on her frame for a good while now...
She urges her to 'stop stuffing your face all the time!' but, let's face it, that won't make a difference to Jess (She is a greedy thief after all!).
I love Jessie's hair-down look <3