Pokemon Tower Defence is the role-playing online game.The game follows the character from the Pokemon Leaf Green.However the story/plot is quite different.Player can take upto 6 Pokemon which learn moves and Evolve just like main series game.The story of game makes all the other people except player the villan.
Its sequel Tower Defence 2 is also made with enhance characters and new features.Type on google about the game and take a look at the game.