With the glitch I was talking about, try this: go through the oak backwards, then defeat the wraith at the top of the oak. Instead of going back in the cave to get to Brittany, head back around and use the glitch again to get into the oak's back entrance. Then 1: get Olimar out; or 2: when Olimar is almost at the end, use a leader (not Brittany) to go through the normal entrance (cont.)