Trust me you can fight mewtwo. an easy way to battle him is to go to multiplayer mode make sure that all items are off and that there is another controller in any of the slots and battle with just player 1 and player 2 then chose a calm stage{i recomed the pokemon battle stage} then scence the oppont can't attack you you can leave it on all night and the next day then when you think 20 hours have past kill your oppont and you should face mewtwo. oh, i almost forgot, put the timmer off and switch the stock to 1 life.

The above answer is right but I have a little to add to it. Ok pick your 2 best characters and when you leave it on for 20 hours i would recommend un-pluging the controls just so nothing can go wrong. Then, after 20 hours, knock off the character you are worst with. Good Luck!

set stock to 1 life and just keep jumpin' off the side of the stage.after you did this a hundred times mewtew will challenge you beat him and he's yours

first of all it's 20 hours and second it adds up even if you turn the game off.have fun

OK you r such a freaken idiot u basturd no u don' have to play for 20 hours strait they + it up you bitc*

Quote: junior bullock

do i play the game for a strait 24 hours or does it add up every time i play?

Play 7oo vs matchz or play 1p for either 20 or 24 hours!!!!
tip:if u see him, use Sheik and his whip then us his side smash.

play for 20 hours or 700 mathes