I used this for the green scrip tile in Pallet Town. Using fat man as person event no. 2.
Then I moved the mart guy to the first step where the fat man would take. When not in the route, he was not visible. As soon as you enter, he becomes visible.
Here is the level script I used. I had the flag set to 7000 and value at 0001.
I gave the mart guy person event no. 2 also, but I dont think it matters. That is who I am controlling, after the fat man dissapears and the script ends.
And thats about it.