first you have to have caught 60 Pokemon. then you go and talk to proffessor oak, and he will give you the rainbow pass. then talk to the rockets, and if you cant battle them talk to celio at the Pokemon center. after you battle the rockets they will move exposing a cave where they stood. then you can go in. use the rainbow pass to go aboard seagallop
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There are move tutors everywhere there is one in particular that will teach moves that your Pokemon tried to learn but didn't that tutor can be found on two island.
a blastoise because she teaches it hydro pump which is the best move ever!!
he is on 2 island near the game building you need to give him tiny mushrooms or big mushrooms
RFDHDF
the move deleter is right of the Pokemon gym in fuchsia city.