It's possible you're referring to a creature from a specific game, book, or other fictional universe. To help me find the answer you're looking for, could you tell me:
* Where did you hear about "artacoono"? (Is it from a game, a book, a TV show, etc.?)
* What kind of creature is it? (Is it a Pokémon, a mythical creature, a monster, etc.?)
Once I have more information, I can do my best to help you find out how to "catch" it! 😊