Pokemon platinum players please help? experienced players please..?

Go south and when you see the two cameramen keep going. when you get to the big collection of houses(AKA its a hotel) go a little left then down again. when you get to the beach turn left again and you should see a house eventually. Go north when you see it and then go through the tall gr left. if you keep going you should be in Pastronia city. its pretty self-explaining after that. Beat crasher wake and follow the galactic grunt. after ya beat him head to Jubilife city and using surf go left across the water. you should then keep going left and through the building-thing(I never knew what those were called) you should be met by professor Rowan's istant, he will upgrade you pokedex. Then continue through cave city but be warned, you rival will want to battle once you get on the bridge so,just in case save before you step on the bridge.