Personally I love Delta Pokemon, and i will go to bat for Metanite. Everyone seems to be forgetting about this little thing called Tech. I've done alot tech work on my Metanite deck and i can take just about anything trown my way. I've destroyed Flariados so many times that i've lost count.
Fact: Metanite is only going to get stronger. With the way the Pokemon TCG is shifting into nothing but delta pokemon, the deck will start having more options opening up for it. Take a look a Dragon Frontires. I've already made a list of the cards i want that will improve Metanite. Examples:
Ninetales d - Psychic - HP70
Stage 1 - Evolves from Vulpix
Poke-Power: Substitution
Once during your turn, you may remove 4 damage counters from Ninetales and discard the
highest stage Evolution card from Ninetales (this counts as devolving Ninetales).
Then, search your deck for a Ninetales or Ninetales ex and play it on top of Vulpix
(this counts as evolving Vulpix). Shuffle your deck afterward.
[C][C] Illusion Tail: 30 damage. Search your discard pile for an Energy card and
attach it to 1 of your Pokemon.
Time to tear up Flariados, and Mewtric with a psyker.
Cloyster - Fighting - HP70
Stage 1 - Evolves from Shellder
Poke-Body: Hard Shell
Prevent all effects of attacks, including damage, done to any of your Benched Pokemon
with "d" on its card by your opponent's Active Pokemon.
[F] Grind: Does 10 damage + an additional 10 damage for each Energy attached to
Cloyster.
Say goodbye to raieggs.
Pinsir d - Fighting - HP60
Basic
Poke-Body: Scramble
If your opponent has at least 5 cards in his or her hand, any damage done to Pinsir is
reduced by 30.
[C] Delta Call: Search your deck for a Pokemon with "d" on its card, show it to your
opponent, and put it in your hand. Shuffle your deck afterward.
[F][C][C] Guillotine: 40 damage.
Say goodbye to most 2-2 Fearrow d. Raieggs and Mewtric will hurt too.
Ampharos d - Colorless - HP120
Stage 2 - Evolves from Flaaffy
Poke-Body: Holon Veil
Treat all of your Pokemon cards in play, in your deck, in your hand, and in your
discard pile as if they have "d" on their card.
[C][C][C] Delta Circle: Does 20 damage + 10 more damage for each Pokemon with "d" on
its card that you have in play.
Weakness: Fighting
Resistance: none
Retreat: 2
Speeks for itself.
Tropius d - Steel - HP70
Basic
Poke-Power: Tropical Healing
You may use this Power once during your turn, when you play Tropius from your hand
onto your Bench. Remove all Special Conditions from each of your Active Pokemon, and
remove all Seal Markers and Thunderquake Markers from all of your Pokemon.
[M] Grind: Does 10 damage times the amount of Energy on Tropius.
Weakness: Fire
Resistance: none
Retreat: 1
Tyranitar d's one weekness.
I can keep going if you want me too but i'll stop their for now. The other thing you have to remeber as the format changes, decks change or they die. And Delta decks are very versitile as most of them use the same cards in the Holon engine(the best engine in the format now) and they can tech in Windstorms and Warp Points(i did to counter Cessatation crystal, Battle frontire, pretty much anything to stop my powers from being turned off).
As much a people love their old decks, it's time to wake up and smell the roses, the Delta revolution has begun.