My pick for Clever Contests is my MBanette named 'Annabelle'.
Annabelle's moveset consists of: Shadow Ball, Shadow Sneak, Feint Attack, and Destiny Bond.
(Keep in mind that Banette's moveset can also be adjusted to work with Beauty, Cute, and Tough Contests as well, due to its movepool.)
1st Turn > Shadow Sneak (makes Pokemon move 1st next turn)
2nd Turn > Feint Attack (works best if Pokemon moves 1st)
3rd Turn > Shadow Sneak
4th Turn > Feint Attack
5th Turn > Destiny Bond (A move of huge appeal, but prevents the user from making any more moves during the contest)
In Clever Contests, there is always the possibility of Trick Room (or other moves that switch the order of appeals). That is why Shadow Ball is on the moveset.
For example, if you use Shadow Sneak with Banette, and a Kirlia after you uses Trick Room, you only have a 25% chance of actually going first next turn. If you appeal Feint Attack without being first, you only get 2
's . So by having Shadow Ball just in case, you are guaranteed to get 4
's on the following turn if you aren't the first to appeal.
(I hope that made sense when reading it back)
________________________________________________________________________________
The thing about contests in ORAS is that they made everything so much simpler to the point where all you really need to do in order to win one is max out a Pokemon's condition.
It's honestly really ridiculous because they took all of the 'skill' out of contests, and replaced it with mechanics.
All you really need to do to win a contest at any rank (and category really) is to max out condition using Rainbow Pokeblocks(+).
You can complete the Master Rank of any category with just about any pokemon if you max out all of their conditions.