Well... if the most recent ORAS leaks are conclusive, then I must say that I'm quite disappointed. Delphox again gets the short end of the stick, imo.
I'm not going to spoil anything, but I just say this: it gets very little compared to the other two starters. They've given tools to Greninja to make it shine even more and tools to let Chesnaught tank attacks more easily.
I'm going to put everything regarding Delphox under a spoiler tag, for whoever isn't interested or doesn't want to be spoiled:
[spoil] Covet - Magician already does that. Besides, Covet is a physical attack with low power.
Signal Beam - useful against Dark-types. However, it also gets Dazzling Gleam in ORAS, which I think is the superior choice.
Low Kick - ...No.
Thunder Punch - If only it was Thunderbolt, or Discharge!
Fire Punch - Meh...
Magic Coat - Makes sense and is kinda useful, however it requires prediction... and a move slot. Besides, it already gets it as an Egg Move.
Foul Play - This could actually be very useful, since it attracts physical attackers. Lack of STAB sucks, though.
Zen Headbutt - Need to attack the physical defense of an opponent? Use Psyshock.
Iron Tail - Tsk, even physical attackers avoid this move. Delphox avoids this even more than them.
Snore - Low power and extremely situational.
Heat Wave - The "Flamethrower" of this generation. It already gets it as an Egg Move, though.
Role Play - Level-Up move. Kinda pointless.
Shock Wave - Well, it actually gets an electric special attack! Too bad that it has low power...
Trick - Redundant, since it already has Switcheroo.
Magic Room - Another Level-Up move.
Wonder Room - Very gimmicky, but I'd like to try to swap the Defense with the Special Defense some times.
Recycle - Useful to regain Power Herbs? Other than that, it has little uses.
Snatch - Try to steal some eventual stat boosts from setup attackers?
Sleep Talk - Uhm... already a TM...
Skill Swap - Give Magician to someone else? It doesn't seem to be worth a move slot.[/spoil]
I'm afraid that it will end up joining the likes of Meganium and company. Truly a pity.