DrawFighters (EP)

Knocking out your opponent is when you do enough damage in battle to deplete their HP completely, knocking them out of the competition. You will need to do at least 34 battles with you knocking out the entire team each time in order to get to the 100 fighters knocked out. The easiest way to do this is to just keep doing training mode to fight lesser opponents who are easy to kill and take out fairly quickly. Just make sure to go to the gym every so often to upgrade your character with your character gems to make sure you stay much stronger than your enemies and then take them out. Once you have knocked out 100 fighters, the trophy will pop.