The only possible use of Luster Purge is to kill an enemy with high SD like Kyogre/Blissey/Snorlax/etc. Mist Ball has no purpose because Psychic has higher power than either move. Luster Purge can reduce enemy SD with higher proficiency than Psychic, and that is the only possible value of it. Just use Psychic though.
Also, quit using gameshark. It doesn't help you win, it just teaches you that you can have any move on any pokemon, and that doesn't hold true for NB. Try NB sometime.
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