More stuff lol...
Relative to the Flygon-Dusknoir-Celebi EX version, consider trying this:
Pokémon (20)
4 - Flygon
3 - Vibrava
4 - Trapinch (secondary starter)
3 - Landorus EX (my preferred starter and very useful against Darkrai EX decks)
2 - Celebi EX (hopefully, never start with this Poké)
2 - Duskull
2 - Dusknoir
Trainers (30)
2 - Bianca
2 - Colress (useful since I tend to play with a full bench with this deck)
1 - Computer Search
1 - Energy Search
1 - Escape Rope (again, useful to get active confused/paralyzed/asleep Poké back to the bench; but your opponent switches the defending Poké first)
2 - Heavy Ball (for either Dusknoir or Lando)
1 - Level Ball
4 - N (very, very useful, especially when playing from behind - which seems to happen 50%+ of the time...)
2 - Poké Catcher (not that critical in this deck)
2 - Pokémon Communication (given the "high" Poké count and not needing to "thin out" the deck that much, Communication is preferred vs. Ultra Ball)
3 - Professor Juniper
3 - Rare Candy
2 - Skyla
1 - Super Rod
2 - Switch
1 - Tool Scrapper (may need to be bumped up to 2 given your area's metagame)
Energy (10)
4 - DCE
6 - F
This version is fun to play, especially when I could Sand Pulse and Sand Slammer multiple times. (I must admit KOing benched Squirtles was soooo much fun). In some games, my opponent would place fewer Poké on the bench (sometimes worked to my advantage). In other games, the DCEs were prime Hammer targets. Another observation: Opponents went "nuts" trying to KO a single benched Duskull (LOL). I did try to bench both Duskull at the same time (or 1 when I thought my opponent could not KO the Duskull) in hopes that 1 would survive till my next turn.
By the way, I now dislike the Accelgor variant; I can't attack T1 and I could not consistently keep the Deck and Cover sequence going. (I also didn't like exposing the "low" HP Mew EX too often either.)
Also, in a game when 2 DCE were prized, the deck is quite less effective.