after you get 3rd badge get rock smash(hm) from the rock smash dude. Use rock smash on the boulder near the wattason family people.battle all the trainers and enter a cave. then beat the 2 trainers nearby
and go up there should be a rest house there.
continue your way left and beat some trainers. after that the should be a muddy brownish grass over
there then get your way to fallbour town. continue your way to a bridge then you should see a white rocks.continue your way to meteaor falls. continue and you will see a team magma/aqua grunt.they will talk about something.then go all the way back and exit that cave that leads you lavaraige town. ther should be a house or something talk to that lady and you will go up.after that go up the wooden stairs and you should see team magma/aqua grunts defeat em all and beat boss archie/maxie.
now go down and go down and head to lavaraidge defeat the gym leader and get the 4th badge then got to petulburge gym and dad shoulnt be there now go through the doors and reach to your dad and finall defeat him.
hope this helps(sorry for the spelling mistakes)