Unlock Hidden Missions in Ultimate Battle [Vega]

NTSC-U Rev1 -temp unlock only-
040FC398 3800001B

NTSC-U Rev1 -perma unlock- (go to options and save your data, you now have the missions unlocked permanently)
C20FC398 00000002
3800001B 9004020C
60000000 00000000

Source:
li r0, 0x1B #Set Ultimate Battle 100 pages to 27
stw r0, 0x020C (r4) #Write it to where Data Save contents reside in memory

#Default instruction of lwz r0, 0x020C (r4) is not needed

NTSC-U Rev1 (Non-ASM) perma unlock; go to options and save data
42000000 90000000
00E5796F 0000001B
E0000000 80008000

'Source'
Set byte value 0x1B at address 0x90E5796F.

Code creator: Vega