You have to get this while in career mode, it can not be done in a exhibition match. If you start off playing Speedball the 4th event you play in is The Valken Invitational. After you win it you will unlock the Valken Shirt and Valken Pants. Then go into manage team and press on the person you are using. You will have to buy these items together they will cost you $600, be sure that you equip them after you buy them. You will then have to go into the gun tab and buy and equip the Valken Proton, it costs $500. When your finished just enter a tournament and win it, the trophy will unlock at the end of the tournament.