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Beat the bardock saga.
go on challeng mode make sure you unlock the one with no colour first
you beat the legendary super saiyan saga .
There is no super saiyan 4, its only until super saiyan 3 (Broly,Vegeta,Goku and Gotenks). There are only characters of Dragon Ball Z Kai, not Dragon Ball GT.
Well that depends on which Dragon Ball Z game you're talking about.Dragon Ball Z Budukai 3 has Bardock as a playable character but you have to beat most of the game.Dragon Ball Z Budukai Tenkaichi 1 and 2 has Bardock as a playable character but you also have to beat most of the game.
finish the gt saga in dragon history
go on the dragon history and win tournaments
Yes there is.
get the dragon balls in dragon history on normal level, summon red shynron, look for the symbol that says Z, next to it it'll say new character, wish for it (or chose it) and you have chi-chi!
with both actually but you have to unlock that move
no you need to complete the dragon road to unlock them all including powered up forms of the z fighters eg:goku super saiyan 3
he doesn't exist. its impossible. In the anime, he can only go up to Super Saiyan 4.