If I have a squirtle, for example, and teach it Iron Defense via move tutor in Black 2 version, can I trade it back to my black version despite it having a move which is impossible for it to learn in Black version? Basically, I don't feel/can't afford to buy the sequels, but want a buddy to help me tutor on some moves I desire. I don't want my Pokemon "stuck," as it were, on his game.