Pokemon Species: Cubone (who will evolve into a Marowak someday, but not super soon.)

Catch Style: Fighting then with super powers, which is pretty simultaneously befriending. As a famous skeleton once said, "[bones are] what's important in life." Papyrus can summon and throw bones, Cubone can throw bones... let's just say they manage to have a pokemon battle between them, and Cubone concludes it has much to learn about life.