A few years ago I had this bootleg GBA cartridge with a bunch of games.
One of them was a Yu-gi-oh card game, which is what I'm looking for, but I can't seem to find the actual name of the game anywhere. I can't look at it on the cartridge either, because I cannot remember where it went.
Anyway, this game was originally for the GBA(clarifying this since these bootleg cartridges usually have NES games). You could select 6(or 8? somewhere around that number) people to battle in this fighting mode. When you select your opponent, they say some stuff, and then you face off in rock paper scissors to see who goes first in the match. Then the card game begins.
That's all I can really recall, except that it also had link support to battle actual other people, but I don't think that's really helpful.