Board Thread:Pokemon Arena X- CAMP (BACK)/@comment-25732562-20150202211742/@comment-6016528-20150204160216

PaxFanHelper - M wrote: Err... Sora, Midge... Ya guys do realize that you can have more then one mega evolution of the same pokemon. Err... Mike... you're wrong. http://pokemonarenax.wikia.com/wiki/Thread:12610

It specifically states that having more than one idea of the same Pokemon is not allowed.