So it's rumoured that there are two more mega stones. Since Blaziken has one, the most likely two Pokemon that are still getting mega-evolutions this gen would be Swampert and Sceptile.

Now Mega-Blaziken is hilariously broken because it kept Speed Boost and got a huge attack buff. And Mega-Swampert would be hilariously broken if it kept its Water/Ground-typing while gaining a defense buff and Sap Sipper.

So what changes would make Mega-Sceptile broken?