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I'm not sure on the exact method, but I've beaten the game on 8 star difficulty (so I can pick the same characters twice), then beat Survival mode as well (not sure on what difficulty). After that, I could access mech-gouki mode, and after beating it I could select Mech-gouki in arcade mode.
funnily enough, the easiest team to beat Mech-gouki with was Dan and Norimaro.
also you need to hold down L AND R both at the same time, not just hold down each one of them.
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