Once you create the script, which it will do for any pokemon, just search through the menus, make sure you put it into a place where there is nothig but free space so you can edit it. Add the comand hidesprite 0x(person number) to the part of the script you want it to disappear at. Then set an unsed flag. Set the number of that flag to the person id of the sprite in amap. This will make it stay gone when the flag is set.