Yanma is a large, red Pokémon that resembles a dragonfly. Compared to its long, thin abdomen, its thorax is short and wide. It has three pairs of two-toed legs and two pairs of wings with red bands on them. A bright green mask marking covers most of its face, and it has two spikes on top of its head. Its blue eyes can see all around its body allowing it to have a high evasiveness. The end of Yanma's tail has two flat extensions from the sides and two gray spikes in the center.
Yanma is a skillful flier. It can make sudden stops, turn in midair and hover in place by flapping its wings at a high speed. It can also generate shock waves capable of breaking glass by flapping its wings very fast. Yanma is often found in wooded and swampy areas. It hunts insects for food, using its eyesight to spot and its flight abilities to pursue prey. Yanma is also territorial, flitting around to guard its territory.
In The Thief That Keeps on Thieving!, Tyler was about to catch a Yanma that his Piplup had weakened when the Team Rocket trio showed up and Jessie caught her instead. They sent her to Giovanni; however, Team Rocket already had obtained a large number of Yanma, and so Giovanni returned her to them. When Jessie used Yanma in battle, she used Ancient Power and evolved into a Yanmega.
Yanma debuted in Wings n' Things, under the ownership of Zachary Evans. Because it was breaking glass in a town due to its inability to control its wings' sonic aspect, Zachary reluctantly abandoned it. Yanma was then captured by Team Rocket and used for one of their schemes, but Zachary rescued it and had it blast the trio off.
In All in a Day's Wurmple, Forrester Franklin's Yanma battled Ash alongside Ariados in a Double Battle, with the two going up against Pikachu and Treecko. After a long battle, Ash emerged victorious.
In Tag! We're It...!, a Yanma competed in the Hearthome City Tag Battle Competition. It fought alongside a Bagon against Brock's Sudowoodo and Holly's Wingull, but they were defeated.
In The Thief That Keeps on Thieving!, Tyler was set on catching a Yanma throughout the episode. In the end, he managed to catch one.
A Yanma appeared in Pikachu's PikaBoo.
In Pokémon Heroes: Latios & Latias, a Yanma was living in the Secret Garden. Others flew over the Tour de Alto Mare competitors.
In That's Just Swellow, a Yanma competed in the Crossgate PokéRinger.
In Lucario and the Mystery of Mew, multiple Yanma were living in the Tree of Beginning, while another was seen in the opening sequence of the movie.
Multiple Yanma appeared in The Rise of Darkrai.
In Tag! We're It...!, a Trainer's Yanma competed in the Hearthome City Tag Battle Competition.
Two Yanma appeared in Pokémon Ranger and the Kidnapped Riolu! (Part 1). A third appeared alongside them in the second part.
In The Thief That Keeps on Thieving!, Tyler weakened a Yanma, but it managed to flee.
Multiple Yanma appeared in Arceus and the Jewel of Life.
In Zoroark: Master of Illusions, multiple Yanma were living in Crown City. Three took part in surrounding Zorua in the park along with the other Pokémon with the intention of attacking him in retribution for what Zoroark did to the city. Before a fight could break out, the Sunkern, along with the other Pokémon, were calmed down by Celebi.
A Yanma appeared in a flashback in Time After Time!.
In Trade, Borrow, and Steal!, a Yanma was part of Kricketina Kylie's Bug-type Pokémon collection, as shown in her Rotom Phone.
||Yanma, the Clear Wing Pokémon. Through the use of its two large eyes, Yanma can see in all directions at once. Yanma is capable of beating its wings at a high rate of speed, generating a powerful shockwave strong enough to shatter glass.
||Yanma can flap its wings fast enough to generate a shockwave capable of shattering windows.
||Two of Yanma's strongest attacks are the Tackle, Double Team, and the Sonic Boom.
Yanma seems to be based on a dragonfly, possibly the banded darter. Because of its size and weight, it might have been inspired by prehistoric ancestors to modern dragonflies and damselflies in the Meganeura genus, commonly referred to as "griffinflies". This is further supported by its evolution, Yanmega, which is much more closely linked to ancient dragonflies, and whose offspring did not have a larval stage, instead hatching directly into a smaller version of their adult phase, as Yanma is a fully formed dragonfly.
Yanma and Yanyanma derive from 蜻蜓 yanma (large dragonfly).