How to beat full ap malphite
So you found yourself in normals with some friends. A full squad of alpha chads but low and behold the enemies have a malphite. You play for 3 minutes and realize he's going ap. Welp lads, only one thing left to do.
Hit 15 minutes and immediatly ff to ruin his fun. There is no counterplay, the way to defeat this ape is to simply destroy your own nexus, take it as a win, and next game it.

and staying out of range are your options. You can always put him super far behind early so he's not a factor, especially since his early CAN be exploited.