LOL
sorry kadaj i had to take over for a second.
In response to Akashi, downtilt is extremely bad in trying trade spacing with metaknight. they have so much room to punish. Shield breaker is also a really bad option, and am not even sure why you would try that as it can easily be reacted to and can lead to being punished by any of metaknights attacks (except forward smash i think). very unsafe option.
Do not use don't tilt vs metaknight in that situation. is so easily punished.
The answer to your question Kola, is you should be baiting his tilts.
this is why walking is so useful. you can weave around an opponents spacing very easily, thus being able to punish their options. Try to think of ways of making it appear as if you're volnurable, which in turn forces your friend to use one of his tilt options. Once you get him to use them unsafely, its just a matter of blocking and punishing.
As mentioned, Jab is really good for spacing.
Many don't know (or maybe do but they dont use this,) but if you have walking momentum and do a Jab, you will slide forward. it's a great way to get inside of MK's spacing if the Mk is playing solid ground game as they should be in this matchup.
Don't forget that Up B out of shield is a great option vs downtilts. you just have to do the really far forward up b. Spot dodging is easily the worse option. If MK does the slow forward tilt, they can wait tilt you spot dodge and hit you with the 2nd or 3rd hit of ftilt.
hope this helped.