Wario is such a horrid matchup for Sonic that if you want to win as Sonic, you'll have to take advantage of your opponent's bad 'player habits' (dodges, movements from ledge, laggy aerial landings, predictable recovery), and if you're up against a good player, those opportunities will come rarely.
There really isn't much you can do about Wario's moves. Dsmash is probably his most punishable one, since it's basically a single-hit Pika dsmash, so shield one hit and you get a free hit or grab- be out of range and you can land a smash on the latter part of the move.
As for landing lag, the most punishable aerials, landing lag wise, are B-air and D-air, but those are rarely done to be laggy.
- If you start shieldgrabbing his aerials, start expecting SH bites.
- Apparently, Usmash (out of dash, or DAC) does fine against Bite (?) but I'm not very adept with using Usmash, so I can't say much.
However, Bite does have some startup lag. Graphic-wise you won't notice it, but his actual hitbox doesn't come out until he fully extends his mouth. It can extend for 2 seconds, but expect a second bite after that, if you come rushing in after his first one ends.
Also, Wario can't eat springs. hint. `.`;
- Recovering against Wario, you don't want to be springing past the ledge unless you can airdodge because he can bite you out of spring. Learn walljump recoveries, and try your best not to be predictable coming back from ledge.
on Farts
- Pay attention to the time. At around a minute, a halfcharged fart can be lethal since Wario can pull it off and do a rest-style horizontal kill. If it's full charged, it's more dangerous to be above Wario, since the fart launches him upwards, and that is a danger similar to ROB's frontal B-air.
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Landing the Fsmash.
After a bit of testing, I have two suggestions that may prove to be useful, should you somehow have Wario high enough so that you can kill him.
- Air-escape. If Wario air-escapes your grab (somewhat random for normal grabs, but guaranteed if you're standing on the ledge, or facing down a hill), you can hit him with an up-tilted fsmash and he can't do anything about it.
- Grounded Bite. Hoorah!! Up-tilted Fsmash > Grounded Bite <-- just found this about 2 minutes ago.
I love you all.