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.