I have won master rank four times so far.
Beauty Master Rank: Dewgong
Smart Master Rank: Jumpluff
Cool Master Rank: Pachirisu
Tough Master Rank: Swalot
Just need that cute Rank Argh!!!
In the beggining of the game when it asks for your name it should also ask if you would like to be a coordinator or a gym battler. I would be a coordinator with my gorgeous Jynx, Froslass, Espeon, and Bellossom.