when u go to wish cave to save mediham, dont take any legendary pokemon or any pokemon who stil CAN evolve. Take ur partner or the pokemon with u have played the main story (if theyre on their last evolvement) then it has many attacks in wish cave at lv 1 but legendaries such as moltres has only agility and wing attack. i succeeded with my lv 38 blastoise once but i started again when nuthin was goin right!