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As for general tips, I don't wanna give tips to beat Kirby! It would be for you to specifically beat one person, which is mean.
Meta Knight...be slow. Do little. It works. Shielding covers ftilt, fair, nair, everything. The only thing shielding doesn't cover are grabs. But besides that, if they ftilt or fair you, you can ftilt them back. If they nair you, you can nair them back. If they dtilt repeatedly, you can wait and grab. If they don't, you can short-hop a fair or dair into them.
Meta Knight is easy to Shuttle Loop. If you think your opponents will try to protect themselves with aerials, you can Shuttle Loop right through them. To recover, you can Mach Tornado across your opponent from above, or fair into them, if they chase you off-stage. If you grab the ledge and they spam Fsmash, you can wait for an Fsmash to go through and ledge-jump.
That's most I can think of right now. If the opponent is too eager to grab you, you can see it coming and spot-dodge. Oh yeah, shielding covers spot-dodges too, because you're WAITING, so when you see a spot-dodge, you can dtilt or grab them when it's done.