Asdfgs i love marth and link!
Anyway like we've been saying, with pit its all about racking up percentage points. His B-down move is a shield, which comes in handy if somebody is spamming you back. Also this probably wont come up often, but if your versing pit, while being pit, if you do his over b move where he spoins his blade, and the other pit shoots an arrow at you, it'll block it and send it back to them(Usefull if they spam you with arrows) Anyway, Using the over b move can be annoying for other players, I like using his shield and his over a and under a and up a moves, because thier not as spammy. It takes a lot for pit to K.O. You. Have. To. I REPEAT. HAVE TO. use strategy when using pit. Lots of dodge rolls, and lots of his nifty blue wings to escape other spammers. However, I believe his shield only absorbs attacks which kinda stinks :C Pit is neat to use if you know strategy pretty well.
Now marth. I lurve marth. (ike is better cough) If you have good timing, and somebody attacks you, press down b to return and block the attack. use over b for a dash attack, so you can either A. get away quickly or B. attack your openent. Marths attacks are strong but, slow which is kind of a downer. I love marth's supersmash. You dont have to be near the person like ike. Over A is a hard move to do if you have a fast opponent, because its a heavy sword. Especially if its laggy. Try not to use marth against fast opponents, like pikachu or sonic. Marth is more of a one hit Ko guy then a strategic guy.
Now link. Link is awesomesauce. He has bombs and arrows man. Anyway, I often use his upB spinning blade attack to deflect spammers aka metaknight tornado's, pit blades etc. Chuck bombs at spammers is also fun. If you hold R(gamecube controller Idk the wii remote controls) and press the over control pad button(Joy stick for wii) You can do a dodge roll, which is effective for dodging opponents. His arrow is quick to pull out after a dodge roll. If a person is on a ledge above you, Up A will bring his sword out and up and stab the person from underneath which is a good attack. But be careful with his bombs(Downb) because if you hold them to long they will explode, and they can hurt you too. Personally I like toon link better, because he has the same move set, but is much lighter and faster. Oh, and if n attacker is in the air, and you want them away, Throw your boomerrang underneath them, because when it comes back its wind will knock them off the ledge.
I hope my ranting helped, If you have any specific attack or combo questions I'm here to helo :3
Im currently obsessed with snake and r.o.b