you can use this cheat w/o using the trainer(the whole point of it) and it can apply it to boss levels within the game. WORKS online as well(tested it and it work both playing online as well as offline)
it doesnt necessarily mean its for ppl who are using the trainer/using the trainer to uber-level to lvl 50 right away. and yes, I agree the mini-game drop loot is better than most drops.
btw, your mini-game cheat request should go elsewhere(perhaps ask Caliber/or one of the other trainer makers)