Ok. In the old set, you could run Milotic, because the energy acceleration needed in this deck is a bear. Yes you run Landorus, but that is one energy at a time and only on Basic Energy. Bleh. The point is to achieve quick KOs on both side of the field. Landorus isnt doing that. Hes stalling while slowly powering up one Pokemon.
In the old set you could knock out Cofagrigus +30, and attack with Lucario with a Silver Bangle for 120. So 150 total. But thats only with one Cofagrigus knocked out. You couldve knocked out a Milotic and powered up another Lucario fully and been able to knock out nearly anything for 180. Or you couldve knocked out another Cofagrigus and knocked out the defending Pokemon that way.
Now Milotic is gone. Youve added in Fighting Stadium and Strong Energy. Youre running two of each. You have no way of searching for then in the deck youve provided. Each does +20. So lets say you manage to get lucky and even get one out on turn two. Lets knock out a Cofagrigus too. So Cof(30)+Lucario(90)+Bangle(30)+20=170. Just short of knocking out Lucario, Landorus, Yveltal, Lugia etc. Takes care of Genesect and Virizion fine though. If you manage to get both out then youre fine. But youre introducing two new elements that you have no way of searching for, on top of having weak basics, and slow acceleration.
The benefit of Strong Energy and Fighting Stadium do not greatly improve this deck, I found that it even hindered it when running enough to be consistent.
Congrats if you get the deck to work but Im simply trying to share what Ive learned when trying to test this deck a few weeks ago. This will not be competetive.