I just fragged all the items when I got a new challenger: You've found a Hidden Opponent!

Johannes challenges you to a fight in the Battle Coliseum! Who is he? Is he new? o.o Or is he unlocked by randomly browsing around the site?

He's the Music Shop keeper. If you destroy a certain item, it unlocks him for battle. You must have had a suitable item amongst the stuff you fragged.

oh I see ^_^ thank you :)

there are ten new Challengers in the Battle Coliseum this year, one per month. Five are NPC shopkeepers and are unlocked in some secret manner (and you stumbled across one of them), and five are those shopkeepers worst fears and are deliberately unlocked via CSC.

Ohhh right I forgot about the csc challengers haha