With all of the donphan shenanigans in the meta right now you shouldn't have to worry about manectric that much. As for Virizion Genesect, the deck is built to counter Virizion Genesect so that should be too much of a problem. If you get stuck with seismitoad then with scoop up cyclone you can...
Pyroar is too easy to play around with the current meta so i wouldn't worry about too much. Dialga you just need to stay ahead and have a backup attacker ready to go (flare tool on keldeo works quite nicely if the opponent is using it).
For consistency I'd suggest
-1 Computer Search
-1...
I would suggest changing the mystery energy for fire energy and adding Pyroar. This is going to be the last year we'll see it in standard but Virizion Genesect is immune to this deck because of the whole verdant wind issue. Pyroar hits grass Virizion Genesect for weakness and will also being...
Pokemon:
3 Dragonite EX FFI
4 Virizion EX PLB
2 Genesect EX PLB
2 Thundurus EX PLF
2-2 Beartic FFI
1 Mr. Mime PLF
Trainers/Supporters/Stadiums:
3 Professor Sycamore
3 Colress
3 Pokémon Fan Club
2 Skyla
2 Cassius
4 Super Scoop Up
3 Ultra Ball
2 Professor's Letter
2 Switch...