We head east of Undella Town to head towards Undella Bay. We use the HM Dive to head into the Abyssal Ruins. We collect some valuable items for cash and also find the the Relic Crown which we finally figured out how to get to. The video will show you how to get to the top which we do near the end of this video. Just follow my lead in the video. If you still can't figure it out, then go to Marriland's channel and he will have a better explaination of how to do it.