Last Update: 04/08/2013
Download Script
Introduction
Relatively simple idea. The battle arena lets you compete in Ranking Battles of Opponent Groups of your making. No need to make them in the database, just alter the contents, and the troops are created for you! Progressive Battling, so you can take your money and walk, or gamble it and continue on in battle.
Script Conflicts and Compatibility
Requires the script ‘Scene_Base‘ v1.4 or higher
Bigace World 
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how do you call the script?!
From a script in an event or a menu use:
$scene = Scene_BattleArena.new