High Kick: Fatality
Low Kick: Alternative Fatality
High Punch: Brutality
Low Punch: Babality
Press UP + RUN + BLOCK in the option screen, until you hear a Thunder sound. One button fatalities are on.
Hold High and Low punch before a round.
Highlight Sonya and push UP + Start. You should hear a boom and see the screen shake.
Select the fighter of your choice and after that you can select the Kombat Zone you want to fight on.