In test play hold circle to run and you won’t have any random battles until you let go.
You’ll run but have no battles.
Accessing the Fu-Ma game for editing
From the title screen choose ”Edit Game” then in the Menu choose ”File” then ”Load”. The game should then display the contents of your memory card (if it has RPG Maker game data on it). Next press ”Circle” then ”UP” to highlight your memory card in the small box above. Press ”X” then choose ”Sample” from the menu. Select the Fu-Ma sample game data and enter the password below when prompted. The sample game will then be loaded into memory for you to play around with.