I’m quoting emblem lords post from smashboards about mk’s worst matchups because IMO he nailed it perfectly:
Snake and Marth are the most obvious ones IMO.
They are comparable as characters. And they both rack up damage fast, but the main thing is that Marth DOES outrange Metaknight and Marth kills Metaknight alot sooner then he kills Marth.
Metaknight is faster then Marth, but not enough to make a huge difference. They are comparable in speed.
They are not comparable in power though. Marth hits far harder then Metaknight. Marth can camp Metaknight hard which gives him the advantage. And Marth and MK are pretty even in priority although Marth may have a bit more.
Marth really can’t gimp Metaknight, but that’s ok since Marth kills MK early around 80%. And Marth isn’t extremely easy to gimp either, unlike say Wolf who is pretty much the easiest character to gimp in the game.
Marth has advantage in the match-up. They are both fast, but MK’s can’t rack up damage as well as Marth because he isn’t as strong. Marth has dancing blade and is generally stronger. Airdodge denies MK’s possible combos while Marth has dancing blade and d-tilt combos to fall back on. MK also has d-tilt combos, but will have less opportunity to use them since he has trouble getting in. Also MK won’t kill Marth until usually around 120%, which gives Marth more time to deal damage and KO MK.
Also Marth only lags more on his smashes, but a smart Marth isn’t going to be throwing out smashes left and right. He he will use them to net kills and that’s it. Marth can use his non-laggy moves to zone MK and make it hard to approach.
There is simply no way MK has advantage or even has a 50/50 match-up with Marth.
Snake has a solid advantage. His tilts have the same range as Marth’s and more power and alot of priority. He can kill MK just as easily as Marth. And he can camp the hell out of MK making it very hard to approach. And when MK gets in he has to deal with Snake’s superior range, power and priority not to mention that even though Snake moves slow he attacks FAST with all his tilts and his jab combo.
This is probably MK’s worst match-up.
ENDQUOTE
Pit can give mk a hard time with his retarded projectile and side b, not to mention his recovery somewhat mitigates mk’s damage racking ability, rob has a very slight advantage over mk as well for the same reasons.
Wolfs bad matchups are…anyone who can gimp him well actually but a good wolf who knows how to stay grounded is tough for anyone.
Bowser’s bad matchups is snake, anyone fast, and anyone with a projectile (especially diddy and his retarded bananas!!!)…yeah my boy bowser has a lot of tough matchups because so much of the cast can capitalize on his uber laggy moves.
Ike is almost directly countered by anyone with a projectile even mario and it doesn’t help that his moves can be seen coming a mile away and IMO he doesn’t hold up to the other swords.
Tether characters…well yeah you get it.