contests oh my god?!

[Shaymin]

ok so look at the picture

see the circled object
it could be this from the previous games

CONTESTS ARE (MAYBE) BAAAAAAACK BABY

[Richard and Blaziken]

Ahhhh yesss, they better be like they were in R/S! Oh my God, I love you Game Freak ;-;

[Spriter]

Oh my gosh yes! If it is an actual thing to earn and not just some sort of "ooh here you go" thing then...they're back baby!

[Captain Jigglypuff]

I've actually always wanted to see Fusion Flare/Bolt, V-Create, Blue Flare, Bolt Strike, Icy Burn, Freeze Shock, Moonblast, and Psystrike used in a Contest!

[Raphetty]

The Hold Hands move you get on the Fancy Pattern Vivillon will probably turn out to be an awesome contest move.

[Captain Jigglypuff]

Relic Song and Secret Sword would also look cool. Especially if Meloetta transforms in the middle of the performance and automatically gets double points for the form change!

[Shaymin]

ok so i've seen the dress up Pikachu in Pokémon Amie so i'm assuming that might actually have nothing to do with contests and the Pikachu in question is probably an eventmon cause of her black heart tail

[Raphetty]

ok so i've seen the dress up Pikachu in Pokémon Amie so i'm assuming that might actually have nothing to do with contests and the Pikachu in question is probably an eventmon cause of her black heart tail

What we know is that there are 5 different costumes for Pikachu, and we can assume that's one per contest type. This is most likely a feature and won't be tied to events.

EDIT: There is also an image of Cosplay Pikachu in a contest.