magma storm has 75% accuracy, not 25%Might as well start discussing on the possible moves ban of option 2. Listed in alphabetical order.
Dark Void: With the only user being Darkrai and it's imposter, with an accuracy that screams RNG (50%), I don't think it's relevant, or would be anyway with other moves ban.
Grass Whistle / Sing: They are sound based moves, with a bad accuracy of 55%, which implies that only No-Guard users can realistically pull this off. Consider that without it, there's a 45% chance of failing with an additional 18% chance of getting a 1 turn sleep, so most of the times you won't get good results. Granted, when you see low accuracy moves the user just gives away the whole set, and you can expect sleep moves instead of receiving them out of nowhere.
Hypnosis: Barely better than the previous option and isn't sound based. To put it in perspective, you have a 40% change of missing and then a 20% of hitting but getting a 1 turn sleep; again, most of the times it's not gonna work well.
Lovely Kiss: This is the first move (given the order of this list) that actually has a positive tradeoff; most of the times you end up getting more than 1 turn of sleep. Accuracy is good enough to be somewhat consistent. This is gonna be banned if the second option wins.
Relic Song: Technically here because it causes sleep, but it has a 10% chance. Might as well use Ice Beam and fish for freeze.
Secret Power: Again it's here because sleep is a side effect when Grassy Terrain, but the chance is 30%. In case of Serene Grace it goes to 60%. It's pretty big given that it does some damage, but to make that work it takes a lot of effort, and isn't probably worth it anyway.
Sleep Powder: The bad mix of Lovely Kiss and Spore. 75% accuracy and it's a powder move. In short if it happens that both Lovely Kiss and Spore gets banned, then this will have to go too. It will still force people to run Googles, perhaps just a little less.
Spore: This move doesn't need an explanation; it defines half of all the items worn in the meta. The ban of this move will affect the meta the most, as a Spore ban will destabilize the meta more than a Lovely Kiss ban. A Spore only meta is more consistent than a Lovely Kiss meta, regarding to both RNG and counterplay (no matter how hard it tries, Spore needs Knock Off to break past Googles and without it it's just not going to work, meanwhile Lovely Kiss works depending on the server mood). Definitely the first or second thing that will be considered.
Yawn: Well. Yawn. Unless you plan on trapping, this is just phaze with extra steps. -ate Diancie could Yawn a Registeel and force either a sleep or having something else getting boombursted, preferably something that doesn't like it. But it could just run coverage and kill it with, idk, V-create.
In short, from my analysis, it looks like that the moves that need to be looked at most are Spore and Lovely Kiss, with Sleep Powder that needs to go away if the other are banned. The other moves aren't good enough to matter tbh.
Lets consider an example; PH Xern breaking AV Pogre because of sleep and Magma Storm. Xern always wins if it gets a full sleep (assuming it hits) and if Magma connects. With Spore it happens 1/12 of the times, with Lovely Kiss it happens 1/16 of the times and with Hypnosis it happens 1/20 of the times. The last one is so rare that waiting for a crit with -ate plated Diancie to drop on switchin said Pogre is a better tactic because it happens more frequently (about 8% of the times). If something is less probable than winning because of a crit, it probably isn't good enough to seriously plan against it at team building.