I once said Dual Brains would be good. Glad to see someone else thought of it. :)
How about Empoleon from Dark Explorers? Give you all important draw? You could also throw in a Exeggute so you don't have to discard anything important.
Shout out to Sirmaiik for giving me inspiration for this deck.
Pokemon 15
1 Bouffalant DRX
1 Keldeo EX BCR
3 Lugia EX PLS
4 Deoyxs EX PLF
3 Yamask PLF
3 Cofagrigus PLF 56
Trainers 33
4 Pokmon Catcher
4 Colress Machine
1 Life Dew AS
3 Plsama Ball
3 Ultra Ball
3 Float Stone
2...
Even though I agree with most of what you are saying, I don't agree on Virizion being useless after T1. I use it past T1 all the time, in fact, last test I did I got all three Genesect's powered up and it ran over my opponent because of Virizion.
There are easier ways to set up KO's for Lugia.
My first suggestions are:
-4 Prism Energy
-4 Porygon / Porygon2
-2 Porygon-Z
Add:
+4 Yamask (See why soon)
+4 Cofagrigus PLF 56 (This is awesome for Lugia EX, setting up Ko's in a breeze)
+2 Ultra Ball
Next:
-2 Shadow Triad...