You must have 7 golden trophies of the arcade, at the robo center, there are 10 levels.
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beat all the gym leade(not including the elites)and you should be able to unlock finding a legendary Pokemon
You are not able to change the lineup in battle arena (battle frontier). What they play is partially strategy as well as you are advised to have tactics in lining. For instance like me, I use Swampert (ground and water) followed by Swellow (not a good flying but can help against Swampert's weakness) and then a Magneton (an extra just in case...).
As of (9-7-10), free to play players have not been able to enter the "mage arena" or the "mage training arena".
yes
you must first get 100% completion on the game before being able to delete/add custom characters.