Mega Zangoose and Mega Seviper continue their feud! For generations, Zangoose and Seviper have battled each other. When a Zangoose lost its heart, it transformed into a Zangoosite which helped it to Mega Evolve and overpower the Seviper population. Since then, scientists developed the Seviperite: The world's first manmade Mega Stone. In this form, Mega Seviper can shave its metallic scales off and compress them with its coil to create more Seviperite.

From my video