Haha, XLR8, the only thing you did wrong was double post to say sorry (or did you double post then edit saying sorry?). Just use edit next time.
janorre, Mega Man is a side scrolling game, RPG Maker XP makes RPG games. But, if you want to make a battle network game, or an action mega man game, it shouldn't be that hard.
May I suggest something? Try to make an original game! Most, no all fan-games in RMXP have never been finished, though there is a zelda game in development that is near finishing. You can make some great fun RPGs with RMXP, so why not try? >,<
If you have your heart set on this, then you might wanna wait for Action Game Maker to come out.