A new video has appeared with footage of the Pokemon X and Pokemon Y demo that was on display at Gamescom 2013. The 10 minute video just shows the player going through an area in the upcoming Pokemon game.
The player has a Froakie as a starter, but also uses a few other Pokemon, including Mewtwo, who transforms into Mega Mewtwo at the start of the battle. He faces both wild Pokemon and trainers in this footage while traveling around the area inbetween the battles. He even comes across a wild Pikachu, so at some point in the game you will be able to get a wild Pikachu it appears, which it no big surprise.