Thanks to Flamewarrior11 For suggesting this Mega. This is my favorite electric pokemon of all time, so I would love to see a Mega for it.

Mega luxray would get the ability infiltrator upon mega evolving, allowing it to pass through opponents barriers and strike. it also gains the dark type. It gets a boost to its all of its stats but primarily its attack. As for appearance it gets more stars on its tail, as well as lighting bolt patterns on its legs and thicker black fur on top.
Stat boosts:
30 attack
20 defense
20 sp attack
15 sp defense
15 speed