Dunno how to explain this one. Originally I was planning on making mega lucario Y, but as I looked for an image to add to I found fanart of different type mega Lucario, so I decided why not.
Fun Fact: I wanted to change the spike a little as to spice it up. After some research, I changed the color to reference one of the most toxic metals out there: arsenic, which is mostly gray, but unstable kinds can be a orangish-yellow.
Type:Steel(?)/Poison/Fighting(?)
Ability:Adaptability(?)/Aura changeoison(?): All fighting moves become poison type
Dex: It's shoulder organs generate and store poison, which is then transferred through it's body. All of it, including it's spikes and fur, has become lethally poisonous
It's limbs are drenched in poison. Some of it stays after mega evolution, which could severly harm Lucario.