My comments on a few of the more controversial and spoken of options so far.
Calm Mind: Yes.... Maybe. It's function on Rockmon has been likened to Alakazam which has been proven already not to be broken. How ever, Alakazam's limitation have also been mentioned in this thread it terms of it's defensive weakness and flaws even when compared to Rockmons. But the most notable difference I feel is not defensive capabilities, or even offensive, but Type Coverage capabilities.
Alakazam has really only been given Psychic, Focus Blast, Shadow Ball, Energy Ball/Grass Knot and 70 base Hidden powers to work with. Even in Zam's Advance days it had the Elemental Punches but still only ran at base 75. Rockmon however is likely to be granted a rather near unparalleled type coverage move pool. This is where my concerns really start.
This is where I'd like to repeat my proposal to omit the base 95+ elemental beam moves from Rockmon's move pool. Supply it with the slightly lower base power moves to work with instead (Discharge , Lave Plume, Energy Ball, Signal Beam ect..). This does two things. Gives Technician more merit once again, as a power vs versatility compromise, as I've express in the past. And also makes a Calm Mind set not quite so overwhelming in raw power, with out taking away type coverage.
Alakazam is high BL. But if we are not careful we might push Rockmon from OU or High OU to Low Uber.
Nasty Plot: No. It was scary enough when we learnt of Azelf with this capability. Fortunately it has proven manageable. Let's not press our luck with Rockmon.
Metal Sound/Fake Tears: No....Maybe. Not nearly as bad as Nasty Plot though. The fastest and hardest hitting users of these are Joltoen, Espeon and Zapdos. But all lack type coverage. Rockmon will not. This may force way to many switches. Accumulating a lot of passive damage along the way, and slapping on a Life Orb, we may still see a world of pain....
Taunt: No This move is the deal breaker. When it come to suicide leads or just making it that much harder to counter in general, this is the move that makes the difference. Give Rockmon, Substitute, Snatch, Mirror Coat or any other of it's friends... just not Taunt.
Stealth Rock: Yes. I'd even support Spikes. It's not Stealth Rock that breaks Rockmon as a superior suicide lead, it's Taunt, as said above.
Hypnosis: NO!! Oh God no.
Baton Pass: No. Could well be broken for several reasons. Leave this to other mons for goodness sake.
Trick/Encore: No. Could be majorly cool for sure, but I'm disliking putting Zam completely out of a job more and more.
Magnet Rise: Yes. Come on guys, this make perfect sense. Don't be narrow.
Almost anything else at this point I think is perfectly viable. It really only comes down to flavor value and move pool space.