Mesprit is a small, gray, fairy-like Pokémon. It has two tails that each have a red jewel encrusted in them. These are, presumably, two of the jewels which comprise the Red Chain. Mesprit has a partially magenta face with four long, drooping appendages and another red gem encrusted in its forehead.
Mesprit's spirit can leave its body without dying and return to the body at will. Legends say that a person that touches it will have their emotions completely drained away. Mesprit was highly feared due to it punishing those who disrespect it; Mesprit will throw their emotions into disarray. Mesprit is said to have taught humans the ability to feel sorrow, pain, and joy. It was shown in The Needs of the Three! and The Battle Finale of Legend! that it can teleport itself, as well as other Pokémon and humans. Though playful, it is a bit mischievous. Mesprit is known as "The Being of Emotion". Mesprit and the other lake guardians have the power to calm Dialga/Palkia should the deity be enraged. In Pokémon Legends: Arceus, Mesprit is shown to be capable of speech via telepathy.
Along with Uxie and Azelf, Mesprit was captured by Team Galactic to create the Red Chain so that they can control the Legendary Dialga. It was eventually freed and helped stop Dialga by breaking the Red Chain. It first appeared in Team Galactic's Ultimate Warrior.
An Emotion Pokémon said to have taught humans emotions. Rumor is, if you touch Mesprit, you'll lose all emotions three days later. It sleeps at the base of Lake Verity, but once engaged in battle, it will rise from the water to fly around the Sinnoh region. Even if you see this Pokémon after your initial meeting, it'll try to flee battle, so catching it is quite a task.
Mesprit is somewhat unique among the members of its trio, as it leaves Lake Verity and begins roamingSinnoh after being encountered by the player in Lake Verity's cavern.
In Pokémon Mystery Dungeon: Explorers of Time, Darkness, and Sky, Mesprit is the only one of the lake guardians to fight the main character in battle during the main story; despite being depicted as a calm and peaceful Pokémon, it was enraged by a previous attack on its counterpart Uxie and quite fiercely attacked the hero and their partner.
Mesprit may be a combination of M of the acronym UMA (Unidentified Mysterious Animal, wasei-eigo for cryptid) and spirit or sprite. It may also involve esprit (liveliness of mind or spirit, and French for 'spirit') or the pronoun me.
Emrit may be a combination of M of the acronym UMA (Unidentified Mysterious Animal, wasei-eigo for cryptid) and spirit.