Real Way Of Earning Tetris

First just train to as high level as possible
if you need guide here is the Link
Then just go to a empty FM and keep summon Mushmon.
It would be hard for the 1st few k of cash as you would need to keep press Z or the loot button for u to loot
when you have enough cash, just buy a pet and mesos magnet, that will speed up the process

Info:
@buytetris - buy 1 tetris which cost 2bil each
@selltetris - sell 1 tetris which you will gain 2bil
go fm>spinel>trade tetris for cash>2tetris for 10k or 8tetris for 60k