If you can remember the email address you set it up with, when you get to the log in screen click forgot username.
it'll ask for the email address, then send you an email with your username in.
if you can't remember the email I have no idea.
Hope I helped.
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Nottingham, UK 28th April 2012
Masters
1. Tommy Roberts (mismagius terrakion)
2. ????????????????? (Zekrom eelektrik)
3. ????????????????? (Zekrom eelektrik)
4. Ross Gilbert (kyurem kyurem ex mewtwo ex)
Seniors
1. Charlotte m. (Zekrom eelektrik)
2. Dan s. (Mew vanilluxe villeplume victini...