I made the experience that being aggressive is a good choice against Wario. If he wants to do air crap, just pressure him with Bair, it beats out his aerials and doesn't last as long as his air dodge, so he can hardly punish you. Mix this Bair game up with Blaster and shine, that works if he wants to bite your Bair or gets a good position to Dair you.
SH and FH blasters limit his options, but be sure that you space them correctly, otherwise he can AD trough them and punish you.
Warios like to fake approachs with SH AD, just punish their landing lag with Fsmash, if Wario approachs from above with a Dair and spaces away from you afterwards, just punish them with Fsmash again or jump shine the Dair and follow up with Bair/Fair, Wolf is one of the few chars who really has weapons against his great spacing game, make use of it.
If he tries to approach with SH aerials, use retreating Fair, it's > all of his aerials.
And a random Info: Wario is the only Char who gets hit by Wolfs Dair after a foot stool, and you can set up a foot stoll with a SH shine with DI towards him.
(SH shine towards Wario > foot stool > Dair is a true combo)