I know this match up extremely well so I hopefully can add something helpful to this discussion
Here's my take
Choosing the stage
Accept that FD is going to be banned - there is absolutely no way a Wario in his right mind would take anyone, not just Peach, here. That leaves you with BF, SV, YI, PS1, Lylat Cruise, Castle Siege, Delfino and Halberd, depending on how many starters you have
IMO, get rid of
Lylat Cruise. Awful terrain and too many platforms make it hard to get grabs on Wario. It hurts your camping more than it hurts his.
Castle Siege is a potential choice depending on whether you like the stage or not.
Yoshi's Island is another stage with potential due to the tilting platform. Understand that Wario's baiting options are limited, paticularly moreso when the platform is tilting on the side of the stage he's on because he can't commit to an aerial above the platform if he wants to punish you on the ground because he'll land on the platform rather than hit you with the aerial (of course he can pass through the platform and then hit you with an aerial but by that time you might be able to shield or roll away). The inability to ledge hop Fair on this stage does limit your ledge options though.
Pokemon Stadium 1 is a decent stage to choose as well, the transformations can however drag matches out longer than they need to which is not good vs Wario
Smashville is like a smaller FD which makes it a good stage. It gives you plenty of space to camp. The extremely intrusive platform messing up grab releases is an issue though so you may want to avoid this stage.
Delfino has long periods of time which are flat and big which make it an ok stage, you can sort of shark under the main platform aswell. Transformations may mess up grab releases and some transformations make chasing difficult.
Halberd is pretty decent, you can shark here as well, low ceiling makes Wario's Uair dangerous but the same goes for Peach's Up Smash. Stage hazards can interfere with grab releases but the landed part is nice and long and flat
Battlefield is by far the safest and most 'neutral' stage you can pick vs Wario. If in doubt, try and get this stage for the first game. Platforms stay where they are so you either get a grab release Up Smash or a Nair/Up Tilt if you grabbed him under a platform. The platform aren't too spread out either so if he tries to air camp you, he has less stage to work with
Fighting Wario
Whatever stage you get, you are going to have to camp as much as you can
The best way to do this is by using Bair and Fair intelligently. In a neutral situation i.e. no one is recovering/has just been hit, you want to use Bair to beat Wario in the air and Fair to tackle any ground approaches he might use as a mix up
Bair works well in the air but can work vs Wario on the ground if you space it well against his head.
Bair camping as people call it works by you Floating at around SH height or slightly above and using Bair to hit Wario. Bair will beat out all of his aerials
BUT (and this is really, really important) if you whiff the Bair, you leave yourself open for punishment via his Fair or Bair. So in order for Bair camping to actually do any damage, you can:
- Bait one of his aerials by hovering around his range and then punish it with your Bair (safest and most likely to succeed)
- Let go of your Float and Bair into him if he's nearby (not too safe unless he's definitly in hitting range)
- 2nd jump and Bair at the same time into him (works reasonably well due to Peach shifting her arse so much during Bair)
This is the most essential tactic to use vs Wario. If you want to be safe and avoid damage then Bair him when he uses an aerial
........
What if he doesn't use an aerial? What if he's waiting for you to Bair so that he can punish you instead?
This why the match up is so tedious -
it all depends on who throws the first aerial if both sides are spacing really well. Peach's Bair camping and Wario's aerial mobility create a sort of stalemate. If you throw out an aerial though, the other side will get a hit in
I use method 1 of Bair camping as my primary form of defense and then mix it up between letting go of my Float and using 2nd jump Bairs
You can use Fairs to keep Wario at bay in the air or if he tries to grab you, just make sure you overspace them. Fair is too slow to work as an attack move because Wario can simply move in and hit you with an aerial before Fair even comes out. Best to use it as a punishing move to catch Wario out if he moves towards you. Overspace it - if it doesn't hit, nothing is lost. If Wario messes up and attempts to hit you and is caught by Fairs range you get damage and possibly a kill on him. You can also use Floating Fairs slightly below platforms to cover yourself from all angles if Wario is approaching
If whilst you're Bair camping, Wario tries to jump above you and Dair in Bairs blind spot, you can easily Uair him or if you're close to the ground, land and Up Tilt him
Nair is very much a situational aerial/combo breaker. You can mix up your Nairs and Bairs, you can Nair out of Warios Nairs if you DI up
Dash attacks works well vs spaced Fairs and Bairs, Jabs work up close, F Tilt works as a mix up for anti air, F Smash should be stutter stepped cause Wario can punish them fairly easily. Up Tilt works for when Wario's above you as does Uair...all these moves you should use when the situation is right. Turnip help with camping and gimping but don't rely on them too much
Killing Wario
A good Wario will not get grabbed often, if ever. Ironically, his grab range is much bigger than ours and he can easily grab you out of shielded Jabs unless they're spaced to perfection and that goes for all of Peach's moves
Anyway, Wario is going to avoid getting grabbed as much as he can and he's very good at it so don't go fishing for it. Wario can simply jump away if he sees a shield grab coming and can easily Dair you if you use pivot grabs. Pivot grabs are only good if Wario enjoys using lots of Fairs
Wario is going to live for a very long time. He's very good at surviving and has excellent DI. Bait airdodges and Uair/Nair him as he lands. If Wario uses his bike, learn the angle he jumps off at and be prepared to Nair (or if you're really good Fair) him during his lag. If he goes for the ledge, grab it and punish accordingly with a ledge hop Fair if he lands on the stage or a slow get up if he goes for the ledge. If Wario has a fart charged, he'll use that if things get desperate
If Wario does mess up and you get a grab, go for an Up Smash only when he's above 90%, 100% if you want to be absolutely certain you'll kill him. Anything lower and he'll be able to DI and live. If he's below a platform, don't bother with an Up Smash, go for Up Tilt instead
Surviving
F Smash, F Tilt and Uair are Wario's main kill moves. Never land next to Wario, especially if he's walking away from you because chances are he's looking to F Tilt you or F Smash if you really screw up your spacing. If his F Smash misses, get a Floating Dair in or if you're close enough a Dash Grab. If you're in the air, be on your guard for a Uair. You can mostly poke through with a Dair if Wario is directly below you. Airdodge only if its your last ditch attempt to avoid Uair. Just be very careful and you should live for a very long time. Take your time when recovering to avoid getting F Smashed off the ledge or Uaired as you recover. Be cautious and smart
Timing Wario out
TIMING OUT IS A LEGITIMATE STRATEGY ESPECIALLY VS WARIO
Do it if you have to. Due to the stalemate of how camping works here and Peach's poor kill power, it's sometime inevitable. If you lose the lead, don't lose your cool aswell - just keep camping but approach very very slowly so you can get that damage in, get strings in where you can
If you have the lead, camp camp camp. Don't approach. You don't have to if you have the lead
Counterpicking
If you can, choose FD. This stage gives you a definite advantage over Wario due to lack of platforms and flat terrain. IMO, avoid Brinstar because its a good stage for Wario. I don't know much about stages TBH so go where you're comfortable if FD isn't your cup of tea
tl;dr Camp as much as you can, time him out if needs be, play safe and keep focused. This is one hell of an endurance match but Peach can do it. I would say she has a slight advantage over Wario depending on the stage
Sorry for the wall of text
is there a way to do it that isn't gay?
If you want to win vs a good Wario, then no
Sorry xD