As the game is still in BETA there are not many of these types of sites yet dedicated to this kind of information.  The official Plarium one is good for general inquries but does not have very specific information yet.  Hope this helps.

https://mobile-support.plarium.com/hc/en-us/categories/360002058520-Mech-Arena-Robot-Showdown

Smystem crash is best for when they get up close and personal.

Range of this ability is about 20-30m I think.

Ok  thanks  To  both  of  you!

Guardian's Ability: 

System crash

Maximum range:

30-35 meters

This is the info that I collected. Hope it Helps.

30