Kanata is a Pokémon Trainer that battled against
Misaki outside the Roshan Pokémon Center. The battle was refereed by
Nurse Joy (Unova) and part of the battle could be seen while
Ash Ketchum and his friends were nearby talking to
Keldeo.
Misaki's Liepard won the initial match up against
Kanata's Herderrier but it is unknown who actually won the overall battle. His name was confirmed in the Japanese closed captions for the 15th movie.