Quoted By:
I used pic related to win all the contests. The key is poke blocks. No one but Lisia has anywhere near the appeal you do at max. You should always win until master rank.
Talent stage is pretty easy it seems like once you fill the meter it doesn't matter how many more hearts you get it comes down to appeal. I liked to end every contest with D-bond it gave a ton of hearts and even if someone jammed I'd still get enough to finish filling the meter if I hadn't already.