She is your only Pokemon because she wants to be. The first time you meet her in a warehouse and locked up, you save her and she falls in love with you. When girls come near you Then she came out of the Pokeball to scare them. You also scolded her a few times but it seemed like she didn't want to listen. When she heard you had a girlfriend, she didn't come out of the Pokeball for a while, but when you broke up My girlfriend suddenly got out of her Pokeball,She threw you on the bed My darling~