In the zip there's a save from the beginning of the first level (you have to climb the stairs to enter) and a savestate performing a cardbreak/counterattack (for mgba 0.8-6016-bd87038c9 and my European ROM).
I know the savestate probably won't work, so here you have the instructions to do a cardbreak with the save:
Activate OpenGL at any resolution, even x1
After loading the save, climb the white stairs and cross the door
Touch one of the enemies that appear suddenly to start a battle.
Wait for any enemy to activate a card and then press A to use one of yours. The glitch will happen.
(actually a cardbreak is performed after using a card with a higher number than the enemy's or a 0 card)
In a GBA and in GBA's software mode, when a counterattack is executed the screen gets pixelated for an instant.
But with the OpenGL HD mode, that screen effect gets corrupted.
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