I play YZG and I have found that Parallel City is a decent counter to greninja break. If the Greninja Break player isn't playing any stadium you can limit them to only 3 benched pokemon which really hurts their setup.
This card will be a very good card, Its energy requirements are not that bad and paired with Vileplume the special energy on Girantina EX will be safe. Its funny before Seismitoad EX came out there were many people that thought the card was weak because of the small 30 damage the attack deals...
I don't know when it was but I do know that the card was reprinted and is legal to use in standard format. It was reprinted as Black White Black star promo #66.
Ok so most people are aware that Lysandres Trump card will be banned June 15th. One of the reasons the card got banned was it took away a win condition of decking out. After the ban Mill decks might be played again but will they be good at all. As of right now there are only a handful of cards...
I am defiantly going to make a Girantina EX/ Vileplume/ M Sceptile EX deck and maybe include cards like Ninetails and silent lab. The problem when you get Vileplume set up it will probably be Lysandre bait so hopefully they reprint a card like float stone to allow for free retreat so the lock...
4-4 Raichu
3-3-3 Crobat
2 Keclecon
2-2 Ninetails
Could be a start for you, it just depends on what Pokémon you chose to pair with Raichu. The list that GadgetJax mentioned would work just as well but It would have a different strategy. The Shaymin EX would help you with drawing more cards but...