Most of the old magic numbers don't really apply any more. Things like 264 Speed on Reversalers/DDers are no longer as potent due to new items like Choice Scarf spoiling your fun (in fact, 270 seems to be what most Choice Scarfers are running to outspeed Adamant Hera by 1 point). The only ones that do, to an extent, still apply are the defensive ones versus pokémon like Blissey who will use the same EV spread (252 EVs HP, 252 EVs Defence). Even the ones against Swampert are outdated - as there are now new stronger Grass attacks that can easily OHKO. Add to that limitations of IVs on Wifi (if that's what you're wanting to play) and the old magic numbers are suddenly far less important. It will be a while before new ones set in, as the metagame is in its infancy.