Xurkitree is a very tall Ultra Beast that resembles a vaguely humanoid mass of electrical wiring. Its "head" is a white, brightly glowing electric spark with numerous points and no visible face. Below its head is a mass of black cables for its torso and limbs; there are white bands resembling zip ties throughout its body as well. Its arms have ties where its shoulders, elbows, and wrists would be. The upper arms have two cables, while the lower have three. At the ends of its arms are copper structures that resemble hands, each with six flat "fingers". The legs have ties at the hips, knees, and ankles and are composed of four cables fused together for the whole length. The feet have four toes possessing "claws" of exposed copper; each foot has two fused toes pointing forward and two separate toes pointing backward. Finally, its tail has three ties and four cables, one of them loose in two sections. The tail ends in what resembles a three-pronged plug. It is the tallest Electric-type Pokémon.
Because this Ultra Beast reportedly raided a power plant, it is speculated to sustain itself with electricity. This is supported by observations that it will "plug" its limbs and tail into the ground when it is low on energy and enter a tree-like state to absorb electricity from the earth. Witnesses claim that its entire body crackles with astonishing electrical power. According to Wicke from the Aether Foundation, the cables that make up its body have been noted as being made of the same material as electrical wiring, and as such are highly efficient conductors of electricity. Its body contains an organ that produces energy, and it can discharge up to 1,000,000 volts at once.
In Pokémon Sun and Moon, Xurkitree has a catch rate of 30 and a base experience yield of 114.
Xurkitree appears to be based on sparking electrical wires and power-lines. Its design also shares some small aspects of a tree, especially Christmas trees; its head resembles a Moravian star or a tree-topper, while the white bands on its limbs may be based on fairy lights, though they could also refer to cable ties, which are used to hold multiple cables together.
Xurkitree may be a combination of a corruption of circuitry and tree.
Denjyumoku may be a combination of 電気 denki (electricity) or 電磁 denji (electromagnetism) and 樹木 jumoku (tree).