If you also want something relative to your question, Blazkrieg can manipulate emotion either by shouting at their target while behaving in whatever mood will either draw their attention or scare them away, or grabbing their head and chests and forcing the emotional energy into them. This was something I developed from my own assumption involving Osu! Tatakae! Ouendan's method of cheering random people to achieve their goals.
If Team Rocket does succeed in turning Mewtwo into a Shadow Pokemon, I was going to have Ryuta use those techniques to reopen his emotional awareness if and when he ends up getting involved in the upcoming fiasco.