Ramses the Great is one of the “Rare Cats” in Neko Atsume. The way to attract these special cats is to place the items that they prefer into your yard/house. Ramses the Great will only use the item called “Tent (Pyramid)”.
Some of the other Neko Atsume cats will use the Pyramid, too. They either take a nap inside it, or just sit there looking comfortable.
There are four different types of pyramids that you can purchase in the Shop. (Each can be bought with the grey fish currency). If you want to attract Ramses the Great to your yard/house, you need the item that is called “Tent (Pyramid)”. The cat doesn’t use any of the other ones.
Some other Neko Atsume cats will also use the Pyramid.