Inazuma Eleven Go Strikers 2012 Xtreme Download Pc

For anyone playing the Inazuma eleven Go strikers 2013 Xtreme game. How do you unlock Saru's mixi max? I tried to unlock it by following what the website says: needs 50% friendship between Saru and Fei, but the friendship gauge does not seem to move despite training and matches between the two characters :(.