To get a easy fifty wins in survival mode. First thing you do is go the settings menu and set survival mode on the easy setting. Then go select survival mode and choose tag mode instead of single. Switch characters when the heatlh level is at half to switch press the black button. The most effective way switch is to down the opponent then press the black button. The one that is tagged out will slowly being to regain health and you will still the get the health boost that you get when you defeat an opponent.