What the hell is the Klinklang stage ... ?
Haxorus 2.0
You need to pull off a match of 3 every turn without causing a board reset and you should clear all of the icons on the last turn. It's one of the few actually puzzle based stages in the game, and has no luck involved (hence having less HP than Pidgey). You will always S rank it and end with 23% catch rate.
I'm actually done with everything now, Gardevoir, Mega Medicham and Bisharp are the stages to watch out for in this new set of stuff. Goodra is ironically the easiest of the new EX stages despite requiring all current main stages S ranked though, since bringing Goomy actually helps with the constant Goomy disruptions.