Alternatively, if you're using Substitute + set up move, you try to bring in Mismagius on an Pokemon it can force out. As the opponent switches, you set up a Sub. Then as the opponent attacks the Sub, you Nasty Plot/Calm Mind up. Then you're free to either attack or set up another Sub.
Okay, I'll go with that, then. Thanks for explaining everything and helping out with my team (that goes for everyone who helped me).
Now after I edit this post, I'm going to work on breeding them and then tell you the results after a couple of battles.