Secret Memos are a variation of Data Files. Unlike most data files, these do not give any tips or information. They simply have a picture of some pikmin with a number. Miyamoto stated in a Miiverse post that if you collect ten of these meomos the numbers in them will comanate into a Secret Code. So far, it is unknown what effect this code will have on the game. Miyamoto also stated that he will explain what effect these Data Files have later, and that we should try to keep a watch for them.