Nintendo Everything has acquired scans of the latest edition of Japanese magazine CoroCoro showing 'mega' versions of both new and existing Pokemon which will feature in Pokemon X and Y and can be seen below.
Among the Pokemon shown are what appears to be a new evolution for Raichu but there are several others.
Those in Europe will be able to try out Pokemon X and Y at gamescom in Cologne, Germany, later this month which sees Nintendo return to the annual industry event have skipped it in 2012.
If you're not headed to the event, you can check out this analysis of Pokemon X and Y's starter Pokemon and other features.
Pokemon X and Pokemon Y are due for release on the 12th of October and you can find out about the games' pre-order incentives here.
