Oh, yipee, this debate again. Look, I'm relatively new and don't entirely understand the definition of a "healthy meta" or junk like that but I've been laddering and playing in tournaments as much as possible to see where this whole "ban sneasel" vs "ban slowbro" vs "stay the course" debate is derived from. Here are my findings:
1) Sneasel:
Sneasel is not broken. Oh no, look at that, I dropped the bombshell just like that. The truth about sneasel is that yes, offensively, its very freaking dangerous, but its no where near what broken is supposed to look like. Case and point: you can only bring it in two different ways. 1) a slow volt/turn (or whatever steelvally does) or 2) the death of a pokemon. And yeah, maybe pokes dont like switching into it, but its not like sneasel stays in all the time. Anything with thick fat, really good physical bulk, or priority that can survive 1-2 hits forces it out so its a non factor. Things like Scrafty and Z Klinklang can set up, Lix and Rhydon get hazards, and a lot of other pokemon simply survive. Not to mention colbur rotom gets to click willowisp and now sneasel is utterly useless. In addition, playing sneasel is very freaking difficult. You have to know when to click pursuit, when knock off is best, what about icicle crash. Its choice band gives it power, but also limits its options. So yes, it does lots of damage when the user plays it just right, but when they play it wrong, they lose a pokemon, maybe even the battle. I'm not going to say a mon like sneasel is healthy for the tier, it does restrict many ghost/flying/psychics, but I will say that there are ways around it and some of the most common pokemon in the meta like inceroar, hariyama, steelix, and a few others good checks.
2) Slowbro:
Broken? No. Real big pain in the ass? Yup. Should it be suspected? Maybe, but more so the sneasel. Look, remember how I said there is a skill gap for sneasel? Well there isn't one for Slowbro. It legitimately halts a quarter of the tier on its own. Think about that. Any physical attacking mon loses to slowbro one on one. "But it isnt a one on one its a six on six". Well, fuck that, cuz this bitch has regenerator. So now it can practically stall out half a team's offensive power on its own, freeing up 5 slots for you to do whatever the hell you want with the other 5 pokemon. And get this, slowbro is easily the most splashable pokemon in the tier. It is by far the most common that I've experienced and its very difficult to have success against/without. You wanna say sneasel stunts hyper offense? Slowpro obliterates it. Scald is too annoying for physical attacks, walls eat a toxic, aside from guzzlord, slowbro hits neutrally on every dark type (and still has toxic) and makes it so nothing really wants to switch in. Slowbro never dies and always has to be considered when teambuilding. All you really need is a special wall and you kinda win (Type: Null anyone). And sure, a lot of mons exist that hurt it, but it legit just switched. Pursuit is relatively effective, but its also situational. Slowbro doesn't always switch out vs. Sneasel/Houndoom, nor does it need to. A lot of pokemon easily partner with it like steelix, piloswine, really anything that beats electric/bug/grass. The main role it really does to make this meta healthy is not let fighting types completely take over.
3) Considerations:
Sneasel and Slowbro. Slowbro and Sneasel. They do their jobs too well, and thats a problem. But a bigger problem? Imagine one of them being able to freely saunter the meta without the other. In a post Sneasel ban meta, psychics still dont make a comeback because now fighting types have little use, flying types are still also hurt for the same reason. Delphox still loses, xatu still loses, the only real winner... is slowbro. Slowbro loses a major threat. It then dominates the meta more than it did by rending fighting types unviable. An entire typing. On the flip side, you lose slowbro and what happens to the meta? Sneasel gets checked by a large amount of fighting type mons incoming, grass types don't flourish as much, you can bring back poison types, but now, something like Klinklang wins straight up.
4) Closing
You either have to suspect both, or neither. At the moment, the meta isn't perfectly healthy, but if I'm being honest and if the council is honest with themselves, can you ever really recall a meta that was completely healthy. There are always some mons that are way more viable than others because of the roles they play and the fact that pokemons' stats and abilities and moves all vary. Its bound to happen, its why its competitive. If you got rid of sneasel or slowbro, the meta would get broken in a new way, possibly better and possibly worse. Instead, you should really sit down and consider what is occurring right now vs. what a meta without slowbro or without sneasel looks like. Consider what is more enjoyable in a meta, competition, stall, hyper offense. Consider what gives each of you a thrill when you type the letter "p" into the url bar and click enter because pokemonshowdown is the first thing that pops up. Is it because you like mindlessly clicking buttons and being 100% confident itll work like in the case of Bro, or taking a risky gamble that feels oh so satisfying when it pays off like with sneasel. Should matches be fast paced or take 90 turns. These are all important to note while making a decision and based on this (slightly) biased argument, I would say I'd rather suspect slowbro than sneasel. But thats just me.