unlock him by shagging the boss
In Sonic Adventure 2 Battle(she is very hard 2 unlock get all rank A's with sonic!)Sonic Adventure DX,Sonic Advance 1 2 and 3(in 1 of them you have 2 unlock her).Sonic Riders.
Amy is already unlocked, just choose to play as her
in sonic adventure dx you can only unlock metal sonic by collecting 130 sonic emblems.
Rouge can be played as in... Sonic Adventure 2 Sonic Adventure 2 Battle Sonic Battle sonic riders That is all I can think of.
unlock him by shagging the boss
Actually, you can't...... You just.... can't... If you want to play Sonic Adventure 2 Battle, you'll have to buy the game Sonic Adventure 2 Battle (Not trying to sound stupid by the way.)
There are no minigames for the GBA that you can unlock in Sonic Adventure 2 Battle. You can unlock the boss battles and racing minigames, but they are played on the GC like the rest of the game.
You need to have at least iver 25 emblems to get a green egg in sonic adventure 2 battle
Collect emblems
after beating the game 1000times
In Sonic Adventure 2 Battle(she is very hard 2 unlock get all rank A's with sonic!)Sonic Adventure DX,Sonic Advance 1 2 and 3(in 1 of them you have 2 unlock her).Sonic Riders.
To unlock the jewel race you have to complete all of the beginner races.
She is not in kart racing.
Green Hill Zone can be unlocked by getting an A rank in every mission and collecting all 180 emblems.
There is no Sonic Adventure 4 Battle, there is Sonic Adventure 2 Battle but that was released 8 years ago.
No as Sonic Advance 2 came out after Sonic Adventure 2 Battle and Sonic Adventure 2 Battle was only made to be compatible with Sonic Advance.