It could be easy if you have a LV100 arceus shiny and when you beat all the elite in Pokemon dimond, pearl or platnium change arceus into fighting type and K.O. Cynthia.(only if you can)
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Celestic town
You then have to beat Cynthia
you go to the hall of fame and all the Pokemon in your party get a ribbon that proves you beat Cynthia after that there is a long credit roll
impossible
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