Nintendo in Japan released the new Gifts for the My Nintendo users and using your points you can unlock new gift items for your Nintendo 3DS or for your Miitomo!
You can get Metroid costumes for free or for maximum 200 points for your Miitomos and you can unlock a special Metroid Nintendo 3DS theme also for 200 points!
The two battle armors for 50 platinum points available only until September 15, 2016 after that you can buy them only for 200 points!