That means that to have God Wind Armed you need to have 50% frienship with Endou (ILJ) and Tenma (Tenmas). Inazuma Eleven Wiki
The most straightforward way to achieve 100% exclusive content is by playing through the game thoroughly. Make sure to complete all missions, obtain all collectibles, and unlock all characters and equipment. inazuma eleven go strikers 2013 save file 100 exclusive
