Why is anime version of Pikachu so much stronger than game version of Pikachu?
It was probably because in the anime, Ash &amp; Pikachu are the protagonists of the story. So it is only natural to have Pikachu very strong to defeat the antagonists. In the game however, it's up to the player's strategy on how to make Pikachu stronger. Furthermore, in the game, the player can choose any other Pokemon to train to be stronger, other than Pikachu.