In Dragon Arena, select 1P vs. Com and choose your fighter. When selecting your opponent, press RB + Start to enter the password. Enter it "as is", keeping the correct upper and lower case characters. You can also use the character yourself if you do 1P vs. 2P in Dragon Arena; tap RT when selecting your fighter.
Level 99 Goku
Read more: http://www.cheatcc.com/xbox360/dragonballzbudokaihdcollectioncheatscodes.html#ixzz3UNPkGvcS
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