No. That part must be completed to continue with the story.
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Well, Its a thing you do after you complete the game. so i guess
Go to Rustboro, head north out of the town, surf north past a few beaches, and there should be one island with lots of trees, and two trainers. Either battle them or skip them, then go to the rocky part, and it should be at the northernmost part.
you cant you have to complete it on your own
The only way you skip the credits is to set it on the floor and skip over it.
You can not skip levels