This is a good idea, but there are things that need to be fixed.
1. The category for this thread is "Future". If by future you mean you plan to build it in the future but before the next format, this is fine. If by future you meant next format, then many of the important cards are going to be rotated out, and this will cause problems.
-Meloetta EX
-Sigilyph
-Virbank City Gym
-Skyla
-Hypnotoxic Laser
Because of this, I am going to make suggestions (mostly) for the current format.
2. You are trying to use too many different EX's that basically do the same thing. For consistency's sake, I would cut the Meloettas (low HP, not very good by any means, damage output is poor). This would make room for a 3rd Duskull and a 3rd Dusknoir. The 3-1-3 line makes the deck more consistent and lets you be able to sacrifice one or two if need be.
3. There is a lot of energy in this deck. Since your strategy will be poisoning, Toxicroak only needs a DCE. I would cut the Mystery energy and 1-2 Psychic Energy. That would make room for more trainers so you can draw in to them, and in the process of drawing them you will also draw other stuff, which is very helpful. There's nothing worse than being stuck with just meloetta or duskull and a bunch of energy. The switching part can be fixed by using a switch or two, as they won't be susceptible to hammers, and can be searched out with Skyla.
4. You have a wide variety of trainers in small numbers for each one, which is usually not good, since it makes it harder to draw stuff you need every game (Rare Candy, Sycamore, Laser, etc.) To fix this, I would cut the Letters, one Evosoda, and the team flare grunts. Along with that space made from the energy cuts, you can then add in:
-2 Sycamore
-2 Shauna
-2 Hypnotoxic Laser
-1 Virbank City Gym (people will counter your stadiums so you want to have as many of these as possible)
-1 Some sort of ACE SPEC card
-2 Pokémon Fan Club
-1-2 Startling Megaphone (Garbodor will shut down your abilities, and your whole strategy of prevented retreat)
-1 Ultra Ball
-1-2 Switch (mentioned in 3)
-2 enhanced hammer/crushing hammer
I have suggested including more cards than getting rid of, and you can decide what you want to add. I listed the add items in (in my opinion) most important to least important.
Another note, there is a card called Keldeo EX, which also wrecks your strategy of keeping the poisoned guy active. An opponent using switch or escape rope will also do this.
I suggested cutting the Team flare grunts for several reasons:
-Using your supporter for the turn is not good for discarding an energy, especially since there is crushing hammer and enhanced hammer.
-Keeping energy off your opponent is very hard, even if the entire deck is devoted to it.
-In this situation, using team flare grunt will just make both players stuck for one turn, at best, and at worst it will slow yourself down.
If I had a typo somewhere and you don't understand what it was supposed to say let me know.
I have no intent to offend you, and if my review was too critical, I apologize. Also, if there is something in the cards I'm missing that prevents you from taking things out let me know too.
.
