press up select and L (for bag items)
if this doesn't work blow on your L button it seems to be common for it to be broken
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if you find a website about Pokemon platinum AR codes email me at landonmeador@gmail.com
Sadly no, Nintendo tried its best to stop all the use of AR on Pokemon Platinum. But hackers found out how to crack the game. But their are many codes out there for Pokemon Platinum that are similar to Pokemon Pearl. You just have to look on the AR website.
ar codes or Nintendo events
That is actually the code to put platinum into Your AR.
go to codejunkies.com and look up Pokemon platinum if its not there then go to supercheats.com search for Pokemon platinum and click on the ar codes button