It's probably best you ask more script help questions on the script help thread! :).
To make the pokeball disappear after selecting it, add in a flag to each of the script.
EG add 'setflag 0x230' to the first, 'setflag 0x231' to the second, 'setflag 0x232' to the third. Then put those '230'/etc. numbers as the 'Person ID' of the pokeballs in A-Map :).