Wolf is indeed the biggest counter to Olimar; a nightmare of fanservice and fur.
Dan has it right, up tilt has priority over wolf's F->A but it won't win you the match, dodge his lasers, and you'll probably get a smash ->A in your face, either tilt, or block and punish, also oddly enough, abuse wolf's terrible recovery, its somewhere in the middle between fox and falcos, and just isn't as effective as theirs.
Purple pikmin to knock him down ALWAYS work to, you can do the "Natural Selection" technique to obtain nothing but purple pikmin, (you'll probably get some white to) this is..assuming the wolf player has started his laser spam.
Good luck, just wait till you go up against a good shiek player
needle spam makes oli a sad captain.