I have lots of friends who play, but there are 2 I just can't beat. They use Fox and Falco. I know that I should chain grab more, but what else should I do? If i can beat them, I would be the best from all my friends.
Fox and Falco are known for giving marth alot of trouble, and these are also known as his most even matchups if both players know what they are doing.
Falco:
Playing against falco you must realize that you can't make your approach on the ground, because his shb will lead you into large combos that can sometimes be 0-death. this is somewhat a problem for marth because he is forced to make his approach by air which makes him less predictable and lowers his ability to have mindgames. The only way to avoid not going in the air is wavesheilding, which allows you to shield falcos laser and possibly get a shield grab in. a great example how marth's take advantage of this is found on youtube with Husband(marth) vs Dope(falco) on PKS.
Even though falco out prioritizes you in the air, you have a disjointed hitbox that you can use against him that with good spacing should help you win this match. Tech chasing falcos is one of the many things that the marth must use because his grab range is amazing, plus if you can read the falco's tech with good spacing you can tipper him.
Fox:
Many Marth noobs will tell you that fox vs marth is an easy matchup, but this is probably marth's 2nd hardest matchup tied with falcon. What makes this matchup so difficult is the fact that a GOOD fox will be very hard to grab because of all of the moving around fox does to mindgame his way into your spacing. Fox also has lots of easy combos that he can use on you such as uthrow to uair chained together with 2 maybe even 3 uairs if his uairs are LC'ed properly and the marth doesn't DI out of it.
The only thing that fox suffers from most is that his range is poor when put up against marth's. Marth's grab range is more than any of fox's attacks. the only thing that can win this matchup is abusing your spacing and playing both a technical game and some mindgames, more so on the technical though. Make sure that you have your chainthrows down to almost perfection because if you don't punish a fox or falco for their mistakes, they will definetly make sure that you suffer for yours(they are the most technical characters in the game, it seems impossible to be not technical with them).
To Metal Reeper:
You are right, it is true that Marth is one of the hardest characters its seems like to create mindgames with, but its not so much as creating mindgames with marth as much as it is to manipulate your opponent to attacking and punishing them by making them imply what your going to do to get inside their range and abuse them for their offensive style. Marth's mindgames are basically making your opponent keep guessing on what your going to do for an approach and worry about your dash dancing.
hope this helps.