To start this mod you have to spawning two mobs which will defend themselves when being attacked. Such ones include hostile mobs and iron golems.
Then long-tap each mob using the Battle Mob Selector item to select the battle champions. The item can be found in your creative inventory.
You will hear a short pling sound when selecting each and when both are selected a long pling sound will be heard. As soon two mobs are selected they will start fighting each other.
In this case the iron golem on the right appears to have been the strongest and most skilled fighter.
First of all, to use any mod/mods you will need Blocklauncher
or Blocklauncher pro. You can find it on the app store (for kindle and android only).
Step 1 : Download any mod/mods of your choice.
Step 2 : Open Blocklauncher(free/pro).
Step 3 : Click the wrench icon near the top of your screen.
Step 4 : Click the manage ModPE scripts option.
Step 5 : Click the import button.
Step 6 : Click the Local storage button.
Step 7 : Find where the mods that you downloaded went (usually under downloads).
Step 8 : Click the mod that you wish to install.
Step 9 : Enjoy the mod/mods that you installed.