the entire waruda machine
If we wanted to keep Mega-Rayquaza in its current state (even without minus buffs) in this metagame we'd probably have to reslate everything else to make them more broken than they already are. There's a very good reason as to why it's banned from Ubers; it's a 780 BST mon that doesn't need to give up its item slot to mega-evolve and obsoletes all other megas by doing so. This in conjunction with its 105/100/100 bulk AND Delta Stream basically turned the game into a "who has m-ray the longest" type of game. The fact that the required move is essentially the best STAB a Flying type can ask for (Suck it Brave Bird) doesn't help either.You mentioned Rayquaza needing an Orb to Primal reverse, therefore that would be a complete nerf to the already existing Mega, and that's not the point of this meta.