Ness has the range advantage but he’s not used to having somebody with more air mobility than him. It’ll be hard to get in on Ness and you’ll have to kind of bait the Ness into playing over aggressively (which is hard to do because Ness can zone and Wario can’t). Definitely don’t use the bike in neutral that’s a free PK Fire for Ness. Wario is definitely faster in the air though and if he can get in he takes away Ness’s number one strength, control of the air
Ness is floaty so all Wario’s combos will work well on him. I think your best bet is to lull Ness into a false sense of security and then rush him down. Or just rush him down from the start if he’s not ready for it. If he uses PK Fire or PK Thunder in neutral that’s your perfect opportunity to go in, they both lag. I don’t think Wario wins this matchup and a patient Ness will be extremely hard to deal with for Wario but I don’t think it’s an unwinnable matchup. If he’s completely boxing you out there’s nothing you can do but if he leaves openings (nobody is perfect, there will be openings at some point) dash attack is a good way to get in