Just today you had traded yourself a new pokemon for year team because you felt it was lacking in strength to fight the powerful gym leaders. So you made goo trade for a powerful pokemon for one of the other pokemon you caught and didn't trading. However the trainer you were trading from did seem a bit odd on how they spoke about the pokemon and how they worded everything. She said your pokemon will never disobey you no matter what, and something seemed off with that to you.

As you walk home with your new pokemon you hurry back to your camp site to see what your new pokemon is. When you quickly arrived where your camp site you pulled out your pokeball and pressed the button letting the pokemon you traded out

What came out was something you never expected. A Greninja was what came out of the pokeball covered in bandages, burse marks, they looked weakened and starved. As they say you they got on edge about who you were and why you had them.