The Pokemon Company is giving away over 50 prizes a week until the release of Pokemon X and Y on October 12.

According to the GottaCatchEmAll.com website:
The hunt is on. Collect codes for a chance to win exciting Pokémon™ prizes.
From now until October 12, we’ll be hiding secret codes all over the web. When you find one, enter it below to unlock a Poké Ball. Inside every Poké Ball is a Pokémon, a digital gift, and a chance to win. Keep checking back or follow us on Facebook and Twitter for tips on how to find the latest hidden codes.

To unlock the site you need to find the first code hidden in the video they accidentally uploaded last week to Youtube, which you can find here:



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