can someone give me a quick run down of a match up against wario, id appreciate it.
Well, I'm glad I just had a refresher on the wario match up just yesterday. Since you were so vague about exactly what you wanted, i'll break it down best I can.
Things Wario wants from Pikachu.
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-Wario wants to take stage control from pikachu.
-He wants pikachu to commit to an approach that he can punish.
-He wants pikachu on the ledge so he can cover as many options as possible for damage and kills.
-He wants pikachu to challenge his air game.
How Wario achieves what he wants and how to stop it.
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-The bike is his best way to gain stage control. The way to beat bike is to SH AC Dair. It will always beat bike. There are of course many ways to gain stage control (walk up, shield, then shield grab the opponent), but this is one of the main things you'll see from a wario (until he learns we beat that with just one move). Against the bike, however, we should not use tjolt. Tjolt against wario's bike basically gives him stage for free as his bike just eats it majority of the time.
-Another usage of the bike for stage control, instead of riding it to victory, is for him to just throw it while it's laying on the ground. It's a really intimidating hitbox that does over 10% a hit and can rack up massive damage when used correctly. Of course, you can just run up and punish him for throwing it, but when too far away it's a good way for him to push forward.
-Beyond his approaching and taking stage control, wario truly wants pikachu to approach him. His air game is better than pika's. Put simply, his fair>all our aerials horizontally. This allows him to freely counter any aerial approach we may try from directly in front. This means he'll want to bait you into the air, so he'll be jumping around and waiting for your next move
-Another reason he wants pikachu to approach him is due to his command grab, bite. His bite is able to clean beat many of our hitboxes (he grabbed my fair without fair breaking me out). Any strong rush down commitments aren't well advised (dash grabs, run up nairs, falling fairs, etc.), they'll work if he doesn't bite, but if he does it's his advantage. Instead, it's better to keep grounded and use dtilts for most spacing. Also, baiting the bite is also useful.
-Wario's bike, for edge guarding, is one of the most dangerous on stage edge guard set ups in smash 4. He is able to cover all but one or two options every time. When thrown upward, the bike covers standard get up and a jump off the ledge while wario gets to guess whether you will be staying on the ledge, rolling onto the stage, etc. When he lets it sit on the ground, he is able to
use the bike to extend any deadly hitboxes (the waft, an fsmash) to net an early kill off of a read or simply the coverage of multiple options. The way around this is to just guess right. Wait when he doesn't expect it, roll when he isn't covering it, etc.
-Wario's bite is also a great on stage edge guarding tool. It's just a long lasting grab. It will generally be used to catch normal get up and get up attack.
Things Pikachu wants from Wario
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-Put him in the air for juggles
-Put him offstage
What to do when Pikachu has what he wants
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- When coming down from the air with no double jump to respace himself, all of wario's aerials lose to shield. Be careful of a falling bite mix up though. Also utilt and uair will beat out anything he has coming down as well.
-Like any character, put them offstage and go for maximum reward. Even with wario's amazing recovery, at the point he commits to his bike he becomes vulnerable to attack. If he's too low, it is possible to hit him with any light hit off his bike and gimp him that way. If he recovers high (much too high for use to jump up to), it is possible to read the point at which he will start his bike recovery (and where he will end up) and thunder spike him. Other than that, just general edge guarding techniques will be effective.
Other general things to be aware of
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-Wario's dash attack hits when pikachu sits on the ledge too long, the end part of it trips and is a free bike follow up.
-Wario gets combo'd easily by pikachu
-Wario's spaced SH fair on block when retreated and auto canceled is safe pressure.
-If a waft hits pikachu's shield, thunder after it as a punish.
-Wario's down air kills... (i didn't know).
I think that covers all I wanted to say. I hope this helps. I've never broken down a match up before, so I'm not even sure if this is good or not. Maybe I get too specific at times, but it's whatever.