You go to their secret base just tright of lilycove
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in their hideout in lilycove. surf on the sea and get in the big rock, there is also the submarine.
Heart scales are only in Pokemon emerald, ruby and sapphire but you can get one if you trade a heart scale from ruby or emerald or sapphire to leafgreen then take it but it will not do anything in the game.
your Pokemon CANT learn cut in ruby, sapphire or emerald. you have to trade a Pokemon that's holding the TM cut (from sinnoh region game, platinum, diamond and pearl) then take it off them and they can learn cut.
Everything is just completely random it takes a few battles then you go to the Pokemon list in the pause screen then take its item.
that is esay just take or fight him.oak must give all his Pokemon to me the rival also . if he do give put he at ruby or jail.