Aeroblast: A bit conflicted on this one. On one hand, it's a legendary sig move; on the other hand, it's not really heavily tied to Lugia's flavor and putting it on things like Rotom-S still makes sense flavor wise... No comments.
Never mind, Articuno got it already. Allow Aeroblast.
Attack Order/Defense Order/Heal Order: I don't think we'd ever see a Mega other that Vespiquen with bee commanding abilities, so Disallow Attack Order.
Blue Flare/Bolt Strike: Counterpart moves, might as well put them together. These two are too strong and lacks drawback to be given to anything other than Reshiram/Zekrom and Victini. Disallow Blue Flare/Bolt Strike.
Bone Club/Bonemerang: Both bone-themed moves, should be fine giving them to Megas with bones usable as weapons. Allow Bone Club/Bonemerang.
Chatter: Don't really have any opinion on this. Just don't throw it on everyone and demolish Chatot's niche(?), kay? No comments.
Dark Void: Once again, sig move of the legendary of nightmare, but then Hypno and Musharna both have that 'dream' theme. No comments.
Diamond Storm: I would've been completely fine with it were it not for that 50% chance to raise Defense, but it probably wouldn't do much. Allow Diamond Storm.
Doom Desire: Kind of a niche move which means not really many things would use it anyways, but it is definitely a flavor move to Jirachi that I don't think fits anything else. Disallow Doom Desire.
Electrify: Sure, no problems here. Allow Electrify.
Fiery Dance: I'm fine with this, but Fiery Dance might have the potential to completely break some of the Megas, so don't give it to a Mega simply because the flavor fits. Allow Fiery Dance.
Flying Press: I'm not exactly sure how good this move is, but I guess it wouldn't be too powerful. Allow Flying Press.
Fusion Bolt/Fusion Flare: Fusion Flare is just a stronger Flamethrower without the burn effect, while Fusion Bolt is the stronger Wild Charge without the recoil. But then, there needs to be a stronger physical Electric move,and neither move have that much of a flavor issue, so I'd say Allow Fusion Bolt/Fusion Flare.
Gear Grind/Shift Gear: Shift Gear used to be Klinklang's signature move, but then Genesect got it. tbh, any machine-based Megas should fit flavor wise. Allow Gear Grind/Shift Gear.
Geomancy: lol, Megas can't hold Power Herbs. But since the non-Mega forme will get it as well, Disallow Geomancy.
Judgement: Yeah, no. Disallow Judgement.
King's Shield: Aside from flavor and the ability problem, King's Shield isn't really broken, and might help some of the Megas. Allow King's Shield, but if coding allows please add in a clone with a flavor that fits more possible Megas.
Land's Wrath: Weaker than Earthquake without anything better in single battles, and a flavor that probably wouldn't fit anything else. Disallow Land's Wrath.
Lunar Dance: The flavor of the move is tied to the moon rather than Cresselia, and requires the user to sacrifice itself, so it wouldn't be too much. Allow Lunar Dance.
Lovely Kiss: Don't see any problems here. Allow Lovely Kiss.
Magma Storm: This is in no way broken. Allow Magma Storm.
Night Daze: Like Zoroark would actually use this move. Allow Night Daze.
Noble Roar: Arcanine already got it, right? Then it's not really a sig move anymore. Allow Noble Roar.
Oblivion Wing: Flavor issues, duh. Disallow Oblivion Wing.
Parting Shot: Seismitoad got this already, so Allow Parting Shot.
Psycho Boost: A Psychic type Draco Meteor/Leaf Storm, I guess? Allow Psycho Boost.
Psystrike: While it's really useful, I want Mewtwo to retain its(his?) sig move. No comments.
(btw I just realised Psystrike is only 100 BP ._.)
Searing Shot: Almost the same thing with Fusion Flare above, only with the burn effect. Allow Searing Shot.
Secret Sword: I can see this fit into the flavor of some Megas. Allow Searing Shot.
Seed Flare: Pretty much anything with seeds fits the flavor; The problem though is the 40% Sp. Def drop by two stages. I don't know how broken this is, but still, Allow Seed Flare unless it's on things that are probably going to break the metagame in half.
Sketch: Ehhhhh, if it's on the movepol only once like Necturna of CAP I can see this being decent. Allow Sketch that can only be learned once.
Spatial Rend: Dragon-type Aeroblast I guess? Allow Spatial Rend, Though I wonder who can fit the move flavor.
Spiky Shield: This is in a slightly better position than King's Shield, since the flavor problem is not as big. Allow Spiky Shield.
Topsy-Turvy: I guess so. With Malamar not getting enough use, giving the move to others would probably be fine unless Topsy-Turvy becomes Mega Malamar's niche. Allow Topsy-Turvy.
Volt Tackle: I'm in the situation with Psystrike again. No comments.
Water Shuriken: Give the move to all the ninja Megas :P Not really, but that might actually work. Allow Water Shuriken.