In BW002, while in a cave planning their next mission, a group of Koromori was flying through the cave Team Rocket was in. Jessie captured one off-screen, as was revealed when Jessie called it out to battle Ash's newly captured Mamepato. It was only when Iris said its name, that Jessie knew what she had caught. It was able to defeat it with a single Air Slash. It was then defeated by Oshawott's Water Gun.
Koromori appeared again in BW006, where it used Gust in order to create a cloud of sand to allow Team Rocket to escape.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
Trivia
Koromori shares some similarities with Brock's Crobat during its time as a Zubat. Both are based on bats, were seen inside a cave in a group of their own species, and were later captured sometime off-screen by a main character.
Koromori shares its voice actor with Jessie's Yanmega, one of its predecessors.
Koromori seems to be a replacement to Jessie's Seviper, as Jessie uses it to create a gust-storm to shroud Team Rocket's escape, much like Seviper used Haze.
Related articles
For more information on this Pokémon's species, see Koromori.
