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Ultra Forest (Japanese: ウルトラフォレストUltra Forest) is the home dimension of Kartana, located several thousand light-years from Alola. It is accessible primarily through Rarity 3 warp holes in Ultra Warp Ride, rarely through Rarity 2 warp holes and very rarely through Rarity 1 warp holes. It only appears in Pokémon Ultra Sun.
The landscape of this world is that of a large expanding forests, with trees sprouting flowers resembling the world's Ultra Beast, Kartana. The leaves on the floor are rectangular and resemble paper, and the ground appears to be sandy, resembling a Japanese rock garden. At the end of the area is a large rock where Kartana can be fought. Before the final encounter, Kartana slashes a large rock in two before battle. It seems that the world is habitable to humans as well as Pokémon, most likely due to the atmosphere.
Kartana can be encountered and caught here. One Kartana will spawn per visit. Unlike other Ultra Beasts, Kartana will not appear as ??? and will have its normal species name when encountered. The Kartenvoy in the world are forced encounters, registering Kartana as seen in the Pokédex.
The following is a list of cards mentioning or featuring Ultra Forest in the Pokémon Trading Card Game.
Ultra Forest Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a green background are legal to use in both the current Standard and Expanded formats.