okay so here's the best way to approach fighting a metaknight:
-DON'T APPROACH METAKNIGHT. he's going to punish you if you dash attack him by spotdodging and punishing your cooldown lag. he'll just whack you out of a dash Usmash... you could get lucky and hope he reacts incorrectly, but I wouldn't bet on it.
-His air game will kill yours, so STAY GROUNDED unless moving in for a Uair kill.
- Lots of your moves, if timed correctly, will go through his priority tornado.
-DON'T LET HIM TOO CLOSE Dsmash if he's right on top of you.
-Use din's to force him to approach.
-Usmash destroys any attempt he makes to come at you from the air. It'll be your best friend.
-Usmash allso punishes a power shielded shuttle loop.
- he's REALLY lightweight so you can kill him at obscenely low damages as long as one of your KO moves is relatively fresh.
- Be smart with Farore's wind. It's a slow recovery, so make sure you employ it in the safest manner possible
-A glide is easily punnished by Din's fire
-if you can short hop into a lighting kick, I'm pretty sure you can KO metaknight at 50%
-if he goes up with his tornado and you find yourself below him, he can't airdodge, Uair will kill him at low damage, if Uair has a lot of decay on it, Utilt is also a strong option. if neither of those are practical, Usmash is good for building damage and high damage KOs
-Din's fire is quite capable of actually KOing metaknight if his damage and screen position are high enough or close enough to the edge.
-DON'T TRY TO FEND OFF HIS AERIALS, they outrange yours.. just avoid him. If he's dumb enough to get in lightning kick range then punish him with a FRESH lighting kick instead of one you failed to land 7 times.
-Save a jump when you are in the air.. it makes you more versitile and you have a better chance of escaping.
-You won't get off your spike... don't even try it.
-You also will never land your Nair because of its range... only use it to refresh other moves.
-Don't neglect tilts or her neutral A. You need all the speed to can get in this matchup, and they refresh your KO moves.
-if your Dtilt causes Metaknight trip, which it's likely to do, it's impossible for him to avoid a Fsmash if you follow up with it. (Moral: follow up successful trips with Fsmash)
-Nayru's love is a great "get the hell off of me" move, and since you won't be reflecting anything, it'll normally be pretty fresh. it's a great alternative to Dsmash when he's too close. it tends to be better at dealing damage, but it doesn't have the KOing power.
- KEEP IN MIND that even though the matchup is roghly even, he WILL win if you make too many mistakes. Don't get complacent just because you are one of MK's harder matchups