Palafin Hero Form

How do I get the hero form for Palafin? Is there an item I need?

You need to send it on a scour mission to the Ocean area

if you cant send your palafin on a scour right now or dont want to wait an hour for it to come back, you can dex my palafin if you want! i dex for free, just get him back to me as soon as you can if you decide to dex! my boy

I just changed him into the form, thanks.