Dragonball Z Legacy of Goku II [GBA]

To unlock Mr. Satan get everyone but Goku to Level 50 and then go through each character's Level 50 Area and collect their Character Trophies. Then, simply beat the game and you'll get Goku's Trophy, with a message of Mr. Satan now being playable.

To see the other ''special'' ending to the game, unlock Mr. Satan and get him to Level 50. Then, go to West City and break down the Level 50 door to ZZTV and you'll see a different ending to the game.

Gohan's Trophy Get to Level 50 with Gohan then go to the ''50'' gate outside Gingertown to collect the trophy.

Goku's Trophy Finish the game.

Piccolo's Trophy Get to Level 50 with Piccolo then go to the ''50'' gate at Namek planet to collect the trophy.

Trunk's Trophy Get to Level 50 with Trunks then go to the ''50'' gate at West City to collect the trophy.

Vegeta's Trophy Get to Level 50 with Vegeta then go to the ''50'' gate at Northern Mountains to collect the trophy.

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Dragonball Z Taiketsu

Here is a almost complete list of each character you can unlock:

Brolly Beat with Buu
Buu Beat with Piccolo
Frieza Beat with Krillin
Gotenks Beat with Vegeta
Nappa Beat with Vegeta
Raditz Beat with Gohan