pivot grabs pivot grabs PIVOT GRABS
run underneath him when he goes to fair and either bair, RAR up a fair, etc do that ****
don't get hit with dancing blade, but shielding through will work usually, just watch out for shield breakers after that because they will be coming
marth's edgeguarding is serious business, whistle is sort of useful but I usually airdodge anyway. except when they come at you with quick succession fairs you can whistle in that rhythm
make sure you always have as full a line as possible, marth is one of the best at just wrecking all your pikmin so throw two - pluck or w/e and pluck every time he starts WOPing at you as his approach, it gives you more time than you think
like shrink said jabs nairs dsmashes basically the quickest biggest hitbox stuff you can get, if he's behind you and you jab one way it's no big, second jab hits behind olimar pretty far.
I really wish I had recorded some of my matches vs dannykat or jturley