Details: After catching both Xurkitree, return to the Route 8 hotel and report back to Anabel and Looker. Once again, Anabel will inform you that Wicke now has all the details on Xuritree. It is then that Kahuna Nanu returns and tells you that more Ultra Beasts have been spotted on Ula'ula Island, so Anabel suggests meeting back up on Route 13.
Once there, Nanu will further describe how the Ultra Beast Kartana has been been spotted in the nearby area. But there won't be just one Kartana, the Bug/Steel Type Pokemon, that needs captured, but a grand total of four of them. They can be found on Route 17 and in the Malie Garden.
All four of the Kartana will be at Level 60, each knowing the Moves of Leaf Blade, X-Scissor, Detect, and Air Slash. Immediately as each Battle with Kartana begins, like all other Ultra Beast encounters, its highest Stat will be doubled, which is none other than its already incredible Attack Stat. Its Attack Stat will also increase each and every Time it knocks out one of your Pokemon, per its Beast Boost Ability. Kartana is exclusive to Pokemon Sun.
After catching all four Kartana, return to Route 13 to tell Anabel and Looker.