Genos does, in fact, have eyes. While they are thought to be mechanical, due to how he "scans" things, the doctor he gets the modifications from makes sure he can remain mostly human despite being a cyborg. This results in his eyes clearly reflecting emotions, such as pain, or how they shrink in size when he's stunned from Saitama's punch

Along with that, he can feel them getting poked, as a safety precaution. I do not think he has to blink them, though.

A frame is 1/60th of a second in smash 4 whcih runs at 60 FPS

Each move a certain start up, active, and recovery amount of frames

start up is the frame of a move coming out, active is how long the hit box of the move is active and hitting things, and recovery is how long the player must wait until they are ready to use a move again

Also there is hitstun which is how long an opponent is stunned by your attack

So Shulk has too many start up frames on some moves and too many recovery frames on others with a good amount of active frames