Getting 6-0'd usually means one of means two things: Either you lack counters for OU standards, or you lack competative battle experience. When creating a team, try your best to prevent the possibility of one or two pokes to sweep (or go on a KO rampage). Otherwise, if you're new, it's perfectly normal to be beaten at first. No one is really good at anything the first time around, it takes experience, like in all things. Don't let a loss or two discourage you. Think of it as motivation to make a better team.