Hint: Cheaper Extra Fighters
Exit and re-enter the shop screen until the price of the extra fighters are lower.
Hint: Change the Time on the Clock
To change the time on the clock in the clock level, simply change the consoles system time.
Hint: Lots of Points
To get lots of points for buying characters and such, simply go to practice mode and chose any characters. Then, leave it there (without pausing) when you wont be able to play for a while and turn off the t.v., but not the console. Depending on how long you were gone, you could get as much as 7,000 points.
Hint: Save Points
This is a handy tip for saving more points so you can unlock more stuff: If you go into the shop and he costs 2,000 points, simply exit the shop and re-enter, if you see Mega Man again, he could be reduced to as much as 500 points.