Scythe

First, you will need the Himara badge that you will get from that old big tree-I can't remember it's name, it's the one in the future ofSindain.To get the tree to give you the badge, you have to restore Sindain till a particular point and then go to the future with Max's Atlamillia.Talk to it and he will give it or sell it to you.Then got to Rainbow forest and use the badge to become a Himara.Then go talk to as many Himara as you can and one of them will give it to you.

Hope this helps!