Considering I've gone and done this for you, gifting me some credit would be appreciated :P. This script is a bit more complicated then the one in the tutorials, I think that one is actually specifically for script boxes whereas mine should work as a person.
Be sure to set the movement to 11, and the people ID to 0200 or whichever flag you end up changing it to. With this script, the Pokemon will dissapear if you run, use any force running moves like Roar, catch it or defeat it. So essentially you only get one shot. I've set the level to 5 so it was easier to test in a new game so you'll have to change that. Also, I've set the person number as 5 so change the hidesprite '5' to whichever number the person you create is. Also, next time send me a private message (actually please don't I'm not a great scripter D: )
Spoiler:
Be sure to set the movement to 11, and the people ID to 0200 or whichever flag you end up changing it to. With this script, the Pokemon will dissapear if you run, use any force running moves like Roar, catch it or defeat it. So essentially you only get one shot. I've set the level to 5 so it was easier to test in a new game so you'll have to change that. Also, I've set the person number as 5 so change the hidesprite '5' to whichever number the person you create is. Also, next time send me a private message (actually please don't I'm not a great scripter D: )