RE: Back to Basics: Decks
Well I mean the metagame is what gets played, not what is necessarily the best; and fitting cards into Tiers is actually pretty counterproductive for a "new-game" that boasts diversity and every-card-playability. Plus we weren't exactly told to discover the meta here, just post some decks and theorymon around with some new and interesting cards.
As for that Grassbox, you aren't going to be attacking or taking prizes for a while with only seven energy. With only one Revive that means that you can attack with a maximum of three Venusaur, and that is without any Victreebel or anything else. So you are either going to need to up the energy, or overhaul the deck.
As for the so called metagame, well judging by the fact that every deck I've seen runs some sort of Star Engine, that would mean that either Umbreon EX or Luvdisc would be acceptable plays. Just going through all the main attackers available there are:
Victreebel-Could be useful, especially in swarm form, but it seems too reliant on DCE, and has no real backup strategy other than attack, which means that it would fall apart if it faced a drought or a deck with a more complex strategy.
Charizard-About the same as Victreebel, you just take two turns, build one up and start attacking, while juggling energy and other resources. Although at least here you have Victini to help out a bit.
Metagross EX-Absolutely useless.
Ninjask-Draw a card and then swing for at least 40, coupled with Shedinja it makes for a decent card.
Reshiram/Zekrom/Kyurem-Basically just there to abuse Broken Scramble, so I wouldn't call these main attackers.
Golem-With Graveler it has some synergy, and being the same type as Lucario * is always a plus (now you can Ascension the Lucario) and Enraged Linear attack has some potential in this Low-HP-Tech-Heavy format.
Umbreon EX-Good attacks, but not good enough for an EX that is supposed to be a main attacker. This is just a tech.
Venusaur EX-Already been established as a decent attacker in this format.
Magnezone-Bad.
Ditto EX-Completely dependent on how you want to play it.
Nidoking-Probably the most potential for a deck here. The Power is good, and the Energy to Damage ratio isn't half bad, especially in this format. With only one retreat cost, you could use a couple of the PokePowers and then just retreat and attack with a different Nidoking. If you build up manually, that gives you at least 40 damage a turn, plus a ten snipe, just for a single energy.
Klingklang-Good way to stall, if you manage to build one up correctly that means that you are going to only be taking about 20 damage a turn, which can then just be moved away with Bronzong.
So basically that gives you Venusaur Decks, Nidoking Decks, Klingklang Decks and then possibly Golem decks mostly. Ninjask and Charizard get honorable mentions, as does Ditto, if you can make the deck work. Victreebel is disruptive, but it is also going to require you to forego your draw every turn in exchange for grabbing that Grass Energy back. So once your opponent does build up something on the bench and slap through your active Victreebel, you lose.
So with those six decks established as what would most likely be the metagame, it would breakdown something like this: Charizard counters Venusaur and Klingklang fairly well, without having to worry much, and most decks could just adapt and start using the Rocket's Admin (too lazy to look up the name) to disrupt the opposing hand later in the game. In fact, as soon as the Venusaur deck whiffs at getting a Steven's they are going to lose. While Venusaur may have the most consistent damage output (anything that does consistently more than 70 is the best that you get in this format) it doesn't do enough for an EX, and it burns through your deck instead of actually giving you options. With that in mind I'd probably drop Venusaur into either Tier 2 or lower. Klingklang has a solid setup strategy, T1 attach to something else, T2 attach to something else and possibly use your Power to grab a Metal out of the discard (although the only way to actually get a Metal into the discard intentionally would be with Sabrina) and then T3 you get Klingklang, use the Power, and attach that other energy you had squirreled away. Then you can do 40 a turn while reducing by 40. That keeps Klingklang out of KO range for pretty much the entire game, and with a Bronzong you would be immortal, except for Charizard who could outpower you, or the occaisonal Venusaur who could blow a bunch of cards to grab that KO. The only downside for the deck is that if you run out of Metal Energy you lose, and nobody wants to waste time late-game grabbing one from their discard pile. Overall I'd toss Klingklang into Tier 1. Nidoking would probably be Tier 1, as it would be able to beat out Venusaur, and Charizard simply due to energy management. It gets trolled by Klingklang, but that is just life. Charizard would probably be Tier 1.5 depending on where Venusaur and Klingklang fall. Klingklang can still be a 4HKO for Charizard if it has Bronzong out, so Charizard isn't necessarily the best counter for that matchup. Golem would probably be Tier 2, it doesn't do much against Klingklang, although it would be able to snipe out the Bronzongs, which is more than most other decks are able to do. Enraged Linear Attack does bring a new dynamic to the table, which is sniping for big damage, something which may be important in the format. In fact, with Graveler and Bronzong, you should be able to put the perfect amount of damage onto your active Golem to be able to snipe whichever Pokemon you want. The more that I think about it, the more I want to move Golem to Tier 1 (I'm writing this all stream of consciousness). Ninjask and Ditto are both more niche decks, trying to do something new and interesting in a format which basically boils down to attach three energy and attack for something that resembles 60 damage. Although I would like to point out that Ninjask can do 50 damage on the second turn of the game, which is reasonably dangerous. Ditto can also deal 60 damage on the second turn, which is even more dangerous, as Ditto doesn't need to evolve or attach more than one energy. That kind of early game power would make Ditto a staple in more Stage 2 decks, which would still be setting up at the time, and would need something to keep up with the early game 60 damage throwing.
Tier 1:
Klingklang
Nidoking
Golem
Tier 1.5:
Charizard
Ditto EX Swarm
Tier 2:
Venusaur
Ninjask
So what I gained from thinking this much (as far as deckbuilding is concerned) would be:
1. 2-2 Bronzong in most Stage 2 decks. Klingklang needs it, Charizard could use it as a way to charge up more Charizards without damaging them with Firestarter (or whatever it's called). Nidoking has type synergy with Bronzong, and wouldn't mind keeping itself healthier. Golem needs Bronzong to keep ELA accurate. Venusaur could use Bronzong as well, but simply because it seems to be a better idea than anything else in the deck. Only Ninjask and Ditto don't need Bronzong and that is because Ditto needs to avoid unnecessary basic Pokemon, and Ninjask has Shedinja to sudo-heal it.
2. Rare Candy is still necessary, but all of the Stage 1 Pokemon have their uses. Nidorino is great for Nidoking, Charmeleon is good for the second turn of the game, Klang is crucial for Klingklang, and Graveler is also crucial to Golem. Ivysaur isn't all that great, which may be why Venusaur isn't that good either.
3. Play Ditto. For a single energy you can seriously troll your opponents setup, and all you need is to have a decent Pokemon in your hand.
4. Most decks need to have some form of switching in order to function entirely. So you are either going to need to play a lot of PokeToy or rock Phione and Fluffy Tail. I'm still not sure which is better.
Then there are the basic things that I have learned for deckbuilding just by looking through the cards.
1. Play the Stars. You need to play Mesprit and Uxie at the very least. Azelf is alright, but I feel that it is a waste of space. Celebi can be good depending on the deck. Lucario is a bit of a mystery to me, I'd only strongly recommend it in Golem.
2. If you need a starter, play Luvdisc, that way you can at least grab a couple of bench Pokemon and then hopefully stop your opponent from using too many of their Stars. Its all about timing with this card.
3. Mesprit + Jirachi EX should be in every deck that can afford the space. It is the closest thing you have to stalling in the format, and buying yourself a turn or two of time can be crucial.
4. Think about Umbreon EX, the card can be a real game changer, since most decks put at least two Stars into the LZ per game, more if you are lucky. Although a 40 damage snipe is about as useful as Jirachi's attack.
5. If your deck can use Broken Scramble, do it, it has no real drawbacks that I can see, and if you do play BS, toss in a Kyurem just in case.
6. Max your Steven's. It was ridiculous back in HL-On and it is extra ridiculous now.
This post has contributed to Dawn Of Xatu's Grains of Sand!