The worst part about the belmonts is if they get you on the ledge, they can cover just about every getup option with their cross/axe, holy water, ftilt/smash, and reverse up B. I haven't gotten to play any on a stage with platforms like Kalos, or even Yoshi's, but it seems like Battlefield/FD are somewhat rough. Idk I haven't experimented much beyond just playing matches.
I've only faced one Olimar since launch so I can't really drop a fantastic opinion, and I don't even know if the player was just not good or if my strategy just worked tbh. But I just kind of did the old Brawl strategy of running away and laser camping to force Olimar to approach. I hated doing it but only the Yellow Pikmin can get past the laser.
I usually platform camp if I can against K Rool and wait for a mistake. He's such a big body that Wolf can get him to 90+% without any issue if you don't get hit with his side B at all. His moves are stupid if they get you but I honestly don't think he'll end up being a top tier in the long run. Same with Snake. Gimmicky characters always drop once you figure out how to beat their gimmick.
Pikachu and Pichu are so small that hitting them when they're on the ground feels unbelievably hard and unsafe. I feel like Wolf needs to take a beating and whiff punish these guys. Reflecting Thunder seems legit though, if they ever try it on you. To be honest I haven't played too many of them to give any high amount of detail.
I think Mewtwo is going to be hard no matter how many balance patches there are because he never has to approach if he doesn't want to. His projectile is just as good/better, he outranges all of Wolf's aerials, can reflect lasers, and has multiple throws that kill. And to be subjective, his nair is ungodly frustrating in every way.
Now the ones I've had the most issues with are the Marth clones. Maybe it's because they're all anyone is playing, maybe it's me, maybe it's the matchup. I don't know. I feel like laser camping is the best, no matter how much I get bored with it. Chrom hits like a truck and is ungodly fast. I think he's more of the glass cannon type that they wanted Little Mac to be and probably what he probably should have been. His aerials beat Wolf's and have crazy knockback, and he has stupid easy combos and kill confirms with jab. I tend to internally panic a bit when Chrom jumps over a laser to get in my face (and I always thank the hitbox on the blaster). Though, a well timed laser gimps Chrom, if he tries to recover low, you can spike him with dair easily. Roy isn't quite as spicy (even though he's Fire Marth) but the tactics mostly remain the same minus the gimp punishes. What I like about fighting them on stages with platforms is that you can very easily extend your combos on them using the platform since they're such fastfallers. I feel a bit the same about Lucina and Marth to an extent, except they're just milder and less in your face, more wall you out, whiff punish, intercept recovery. I think these guys will turn out to be harder for Wolf in the long run. Laser camp all day. Yawn.
Edit: I'm also curious as to what secondaries you guys have been using to back up Wolf for some of the more annoying matchups. I've basically been solo maining him and haven't really even touched a large majority of the characters yet.