Well, umm, I'm not sure any of us are "pro" yet, but your way of asking for help... is hopeless. We need details for why you can't seem to beat anyone. What moves are they using, what moves are you trying to use, are they just a lot better than you perhaps? Basically, I would suggest you start at Echo's guide however, its stickied up at the top, shouldn't be hard to find. Then, once you've really absorbed all you can from it, and from just reading around these forums in general, and have spent a large amount of time with olimar so to know how he works, if you still need help, i'm sure all of us will be more than willing to help answer any slightly more specific question you have =) Watch some of the many videos, read and reread the guide, read others posts and threads, i can promise you this, its not gonna happen overnight, so put the time in not just playing olimar and being frustrated, but checking things out here, and with time and knowledge you'll get there, promise.
-True