I feel I’m compelled to consider the influence between those two brokenmons before banning. First, Sableye is a good measure of checking Alakazam, and vise versa. Specially Defensive Sableye is immune to Alakazam's two attacking types, while the weak Shadow Ball 3HKOs even with Life Orb. This is pretty obvious--and I dare say one of the most reliable way--of checking Alakazam. On the other hand, Alakazam is immune to all passive damage, so it can force an attacking move and scout the Sableye’s set. Luring the payback allows easier switch-ins. Especially considering that even Lum berry stuff can't switch in directly on either a Taunt or WoW, getting my Lum Berry physical attacker on a weak Payback is a blessing. OK, that might be a stretch—it’s a way, but there’s better ways to handle Sableye out there. If you observe these cases, you’ll see that Sableye ban will almost directly lead to Alakazam ban, but not vice versa. Taking this into account, let us proceed.
The bigger offender at the moment is Alakazam, because he's just ridiculously strong, no other way to put it. He shits over stall teams with immunity to passive damage. If you're playing offense, he's super fast so your only bet is Scarfers. I mean, it's really really dangerous to switch into it period because Scarfers can't take his attack (unless you predict a Psychic move and switch in a Scarf Krook or something, idk, but two can play the prediction game.) If you look at a lot of ‘I have no safe switch-ins’ type of Pokemon, you’ll see that they have really mediocre speed if they’re not gonna get banned. Alakazam is fast & has no switch-ins, and that’s what breaks him. You're pretty bad if you can't get any kills with Alakazam.
Arguments against banning Alakazam? It can't have both Recover or CM (which allows it to do Stallbreaking duties) and Substitute (which allows it to be ridiculous vs offense) unless you ditch Shadow Ball and get walled by the other top Pokemon of the tier. If Sableye wasn't here, then there's no question asked; Alakazam would be banned. Still, the ‘Zam user is in complete advantage because as the opponent, you don’t get to see what moves it has.
Sableye is really summed up by Honko--you have to prepare for it, and it just becomes a lame Pokemon. It will either give up momentum to stuff like LO Moltres which just start wrecking through your shit, or it will get a miss / face Lum user and just die. We all know switching it in is rather difficult, while forcing it out is predictably easy. The fact that a lot of Sableye users really depend on it is the final nail in the coffin, especially when the opponent needs to make just a tiny change in his team in order to turn a tough battle into a one-sided rout.
However, I do see a possible counterargument to the "just carry Lum" argument. In DPP, Wobbuffet was entirely 'counterable' by carrying a Shed Shell on a target that you know it's going to switch in on. You might say the Team Preview makes all the difference, but in the Teambuilding process level, it's quite similar: in order to prevent this one mon from switching in and wrecking it, I'll carry a super situational item. Shed Shell didn't prevent Wobb from being banned. Balloon didn't prevent Excadrill from being banned. Choice Scarf didn't prevent Thundurus from being banned. All these items are ridiculously useless and situational. (In case of Scarf, it was ‘useless and situational in the given metagame with Excadrill’, or so they say.) In case of Balloon, it is a consumable item that may be used up during the course of the battle, making it super unreliable. A Lum berry is rather situational, and it can be used up during the course of the battle. I realize ‘just carry Lum’ is not the same as ‘just carry balloon.' The balloon is of course a lot more situational & unreliable. I'm just trying to play devil's advocate here because there are some striking similarities. If there's Tspikes up, then you get to burn through Lum and burn him anyways. I guess the Item slot is really valuable to just spam Lum, a really situational item really used for Sableye only (especially as stall --and therefore status spreading--is ironically flat out unviable thanks to the two suspects)
tl;dr: I’d ban Alakazam, and I'm really fine with Sableye in one or the other. Sableye in RU just means a really, really centralized metagame. But as knowledgeable people like Heysup say, 'overcentralization' isn't even a word. You can't ban just because of the 'overcentralization.'
