DragonBall Z: Supersonic Warriors (aka DBZ: Bukuu Tougeki)
Copyright 2004 Banpresto
Music & Sound: Studio PJ co.,Ltd
Tagged by Dais
Set created by Sap Tapper

Two shocks in one - both a good GBA fighter and a good DBZ
game. Music is nice as well, although it's a bit strange.
It all seems to be original. Enjoy.

I'm not quite sure who all is part of Studio PJ, but here's
their homepage:
http://www.studiopj.co.jp/

They've also worked on Nano Breaker, Samurai Spirits 0 (PS2),
Gachasta! Dino Device 2, and Cinnamoroll Kokoniiruyo. 

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The actual publishers seem to vary depending on what site you go
to and which region you're looking at....Bandai, Atari, 
Infogrames, etc....so I'm not going to bother listening all that.