Successfully complete "Road To WrestleMania" mode.
At the character selection screen, press C-Left or C-Right.
At the character selection screen, press C-Down.
Get in tie-up and move the Analog-stick while the spirit meter is in "Special".
Go to the side barricade, then face the crowed and press C-Up.
Start a one-on-one match and select a wrestler that has a manager/valet. Select an opponent that does not have a manager/valet. Then, start the match and wait for a run-in for the opposing wrestler. After the new wrestler enter the ring, your manager will jump into the match and beat up the interfering wrestler.