When you first enter the city at the beginning of the game, do no good deeds unless it is required for progression of the game. Do bad deeds, such as kicking the can at the entrance into the Jetlag Baker to get 1,000 zenny, and kicking drink machines. Eventually Megaman will turn dark blue, and his kicks as well as his other attacks will become stronger. If you keep doing bad deeds, he will turn black. Note: If you do any good deed after turning darker, Megaman will turn back to normal and this will have to be repeated.