You have to do missions in a batlle you've already done. Fir instance if you've foughten raditz then go back to that battle and there will be missions. You can earn up to 3 stars. One missiong is to beat the enemy on hard difficulty,
raging blast 2
no
no
Dbz raging blast have kid buu,super buu all forms,and majin buu
after you complete a battle, go back to it and you will see "missions"there it will tell you what you need to do.
because dbz raging blast is japinesse
not yet
raging blast 2
Yes
Can't
you cannot get it for him
go on youtube type in fusion on raging blast trust me it comes up