Wobbuffet has been banned before in every gen since Stag has existed or at least Stag having been banned.I'm about to say something very controversial- why don't we ban Gothitelle over Shadow Tag? Wobbuffet has never been a real problem, and with dynamax and everything new, he sometimes doesn't live a single hit. Gothorita is forced to hold eviolite, which means it's easy to knock, it can't choice scarf trick you, and overall it's not as usefull as Gothitelle. I think it's just too long of Pokemon becomming completely unusable because people decided they don't want to deal with Shadow Tag. There are only a few Pokemon that get successfully trapped/really don't want to hold a shed shell, which is why I don't see this as a problem. Toxapex is completely fine with holding a shed shell, Corviknight has U-Turn so he doesn't have to, and Gothitelle can never hurt a dark type.
Ferrothorn hates gothitelle, but the way I see it, we lost the most successful Ferrothorn counter in Magnezone, and now you can either lose to Gothitelle OR have a choice to ignore it with shed shell as well, which is a big thing because Gothitelle can't threat anything it's not trying to trap. Clefable can run a little speed to outspeed Gothitelle, as well as try and unaware + setup its way out of it. Gothitelle also doesn't like the Hyper Offense meta that's going on right now, so I say if anything we suspect Gothitelle over Shadow Tag, because it's that one mon that is truly a problem, not the entire ability. I'll take everything back if I can see someone using Gothorita and Wobbuffet successfully and consistantly, but I don't see it happening.
Wobbuffet can also be used to the same, although weaker, effect as Gothitelle with Encore+Trapping.
Trap an unsuspecting non-ghost type, encore into using a move, if it uses a Move one of your sweepers can tank, switch out, and if not, just kill it.
This strategy would be extremely useful this Gen too since Dynamaxing is very hard to stop during and after it is used.