Micromon

The main character has been sucked into the digital world called Pixekai and "your avatar immediately meets a quirky professor and is given a vague mission to explore a large and varied world, taming as many of the 250 different Micromon as you can, and leading them into battle against other tamers for fun and profit".[4] Players are also instructed to defeat 4 Legion Members in order to achieve the title S-ranked tamer. As you explore, a darker grander story starts to unfold, with a Team Rocket-esque evil corporation called Black Root, a mythical Micromon called Vaithe, and eventually a plot to save the world ensue. By the end of the game the bridge between the real and digital worlds is crumbling and only the player can stop it.