Ok, so, I've had some experience with this deck and I can say that my build is working very nicely.
I'm gonna tell you what to take out and why:
-1 Sableye: You will only need 2 at the most each game. Even if 1 is prized, you should be good with just one. I also find myself using Sableye on the second turn more times than in the first one and it's almost the same thing. Also, 3 won't make a big difference.
-1 Giratina EX: I do not like this tech at all. Theere better attackers. I agree that this is useful but it only makes a difference in the Terrakion matchup, and other techs are more effective.
-1 Super Rod: This isn't really needed. I feel like it's just a "filler card". However, it can be useful sometimes. I have considered adding it to my deck.
-1 Eviolite: 2 is what you need. I prefer 3, but I'm leaving free spots for some cards in the end because this deck has many different ways to be played.
-2 Tool Scrapper: It is very useful. Basically, I'm leaving this as an option on the "free spots".
-1 Darkness Energy: You basically have 12 darkness energy in your deck. I know that you might say: "Oh, but Blends can't be Dark Patched". It doesn't matter. You will end up getting Darks in the discard pile sooner or later. You shouldn't really be trying to be agressive with Darkrai early game, but trying
to set-up your Hydreigon instead.
Total: 7
+2 Random Receiver: You can't run a deck with 10 Supporters! And since Sableye can get back RRs, instead of adding a Supporter you add this.
+1 Shaymin EX: This card is extremely useful. This card is the perfect counter to Terrakion. You can bait them to KO your Darkrai and KO them with Shaymin, and then if you putdown another Darkrai they won't know what to do, because, would you prefer to get 2 prizes and give your opponent 2 prizes or soften up what's causing you trouble?
+1 Ultra Ball: Having 4 is very useful. You really want to see these early, so you can start Junk Hunting for them and set-up your board.
+1 Other Attacker: My choice is Mewtwo EX. It can close games off, and I like to catcher out other Mewtwos and use Psydrive on them. That way you get 2 free prizes and your opponent probably won't
be able to respond. You can also use other attackers, like Virizion, Benchtini, Giratina-EX, Registeel-EX, but I feel like this one is the best option.
Total: 5
2 Free spots: with these 2 spots I either put a 3rd Eviolite and 1 Super Rod, or I use 2 Tool Scrapper and stay with only 2 Eviolite. Right now, I'm tempted to say that Tool Scrapper is the best option, but the 3rd Eviolite is really important VS Terrakion. It's up to you.
Also, you should understand that this deck has many options. Using Hydreigon attack is something that you should ALWAYS think about. It can catch a lot of opponents of guard, and it often transforms 3HKOs into 2HKOs.
As for the Rayquaza/Eels matchup, IMO is 50/50. 60/40 in Darkrai/Hydreigon's favor IF the player makes no misplays and has an optimal list. The key is to target their Eelektriks. If they can keep 2 during the whole game, you're probably screwed. If they can not, you will probably win. Time your N's
well, so they can't recover their Eels. That's basically how you play the matchup. Also, if they are stacking energy on a Rayquaza (and have 0~1 Eels), OHKO it with Hydreigon.
Well, here ends my long advice! If you need any more help please LMK!
