You need to steal 50 flags from nearby friend's bases.
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You have to connect with a friend through wireless communications.
you need to steel a flag
the first star is easy (beat the elite four and champion)the next star can be obtained 4 ways:Winning any Master Rank Super ContestEarn a Platinum Flag in the Underground by getting 50 flag capturesCollect all 493 Pokemon in the national dexDefeat 100 Trainers in a row in the Battle Tower
I'm sure there's a code that allows you to do that.Or, you and your friend,relative could put your secret bases next to each other and go in and out of the bases with the flags until you get Platinum.
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