Already won the Master Contest but haven't painted in the art Museum in Lilycove?
The first judging is when the audience vote for their paborito pokemon. Audience that vote your pokemon will pop out a love, right? This is the main trick:
[b] The guy in the right, wearing painter clothes, should vote for your pokemon. [b] If he doesn't, load the game. XD
After the guy vote for your pokemon, then good luck for the primary judging, when the contestants appeal moves.
A scarf* could be necessary.
I've done this a few times and it works.
*scarf: go to Slateport, to the tagahanga club and talk to the old man. There are five mga kulay of scarf, red, blue, green, yellow, and pink.
The painter guy should give a ♥