My Overclocked NES!

[133MHz]

Mine crashed over 2.5 MHz, but satoshi's console would take way over 3 MHz and still run perfectly.
The only way to find out is by testing.

[Blue Protoman]

Would this make the Megaman series flicker/slow down less?

[UglyJoe]

It will help the slowdown.  It will not help the flickering.

[Blue Protoman]

Is the flickering done by hardware or is it programmed into the games?

[nintendodork]

It's because of the graphics..so I guess I'd say it'd be the hardware not being able to handle the sprites.

[manuel]

The flickering isn't programmed by purpose.

The Famicom is only able to handle a certain number of sprites in one line. If that number is exceeded, the sprites start to flicker.

[UglyJoe]

Is the flickering done by hardware or is it programmed into the games?

Programmed into the games.

Like manual said, the FC/NES can only handle 8 sprites per scanline.  More than that and the graphics become unpredictable (if it even lets you do it...I forget the details).  There's a register that gets set when this happens.  It's up to the software to check this register and act accordingly (ie, toggle/flicker the sprites to give the illusion of more than 8 sprites per scanline).