Answer:
in all three of the first it is very easy to get an almost ifninite number of any item in the 3rd or 6th item slot by beating the elite four. warning very dangerous for game!!! talk to the one guy that teaches you how to catch a Pokemon as soon as he is done go to one of the towns next to the ocean on the left side and swim up and down the coast there until you go against the Pokemon missingo do not catch it run or kill it. then the 3rd or 6th item gets a glitch next to it. you now have an infinite number of that item almost. can be done repeated ly by doing the steps again