Thread:Liammclovein/@comment-33080963-20170923111133/@comment-32233739-20170925124918

they were distributed as rewards for the facebook campaign part of 200m downloads....

so everyone got 14 of the gokus and the 7 medals required to dokkan him...

not sure if there is any other way to get them at this stage...

http://dbz-dokkanbattle.wikia.com/wiki/Awakening_Medals:_Goku_(Spirit_Bomb)