What is This Glitch? Edit

On Dragon Ball Z:Supersonic Warriors game for GBA, there is a glitch which lets you to battle two glitch bonus battles. To do this: Firstly go into Gotenks' story mode. Complete it. When the screen tells about Goten and Trunks fighting in a tournament, start pressing A button insanely. If done correctly, You will be fighting a Gotenks vs Gotenks fight in Porunga stage.Kill the other Gotenks. Then an empty talking box should appear. Press start. Then you will fight again a Gotenks vs Gotenks battle in the Time Chamber. Kill him. Then a screen with very glitched text should appear with a buzzing sound. That is the end of glitch battles, as I know it.