COMPETITIVE Hydreigon Control

DESTROY EVERYTHING!!!

Anyways, I'm a big fan of Hydreigon, so of course I wanted to make a fun deck with it. Tera Hydreigon ex has a good attack which deals a respectable 200 damage to the active, and mills 3 cards from your opponent's deck. That alone, while kind of annoying, isn't a huge threat. To improve it, we have more cards like Vileplume and Pidgeot ex which can aid in your consistency and disrupt your opponent even more! And if you feel spicy, you have plenty of rainbow

DESTROY EVERYTHING!!!

Anyways, I'm a big fan of Hydreigon, so of course I wanted to make a fun deck with it. Tera Hydreigon ex has a good attack which deals a respectable 200 damage to the active, and mills 3 cards from your opponent's deck. That alone, while kind of annoying, isn't a huge threat. To improve it, we have more cards like Vileplume and Pidgeot ex which can aid in your consistency and disrupt your opponent even more! And if you feel spicy, you have plenty of rainbow energy effects through Neo Upper Energy, Counter Energy, and Super Boost Energy to fuel your Obsidian attack and inflict a huge 130 damage spread to 3 of your opponent's Pokemon! If you are able to land 2 of those successfully, that can often eough close out games or greatly shift the balance in your favour. Of course, silly spread isnt really what you're planning to do all the time, but having the option available is always nice. And to top it off, Black Market Prism also annoys your opponent by slowing down the prize race.

This deck is your average Bunnelby spam deck, where you want to get all of your basic out on turn 1 by hard digging for Guzma & Hala to get Artazon, Capture Energy, and Technical Machine: Evolution to evolve your entire bench to get a Hydreigon ex, Vileplume, or Pidgeot ex. Which ones you want to get greatly depend on the matchup, since you can only get 2 stage 2's from scratch. This unfortunately comes at the cost of your opening first turns being incredibly predicatble, so be prepared from your opponent taking advantage of your extremely passive first turn.

As for your basic matchups, Regidrago can be difficult with its easy access to both spread and Garbotoxin, which can make your benchwarmers easy pickings for them. to counter this, I have Stealthy Hood to attach to either your bench barrier or Vileplume, as it will counter the effects of Garbotoxin. Karen will also slow them down considerably.

This deck eats Calyrex-Shadow for breakfast from my tests. You can blow up whatever they play with your default attack thanks to weakness, allowing you to easily take 6 prizes. I considered even running Wide Lens (Roaring Skies) to shift the matchup from "heavily in your favour" to "auto-win," as it lets you Obsidian-snipe their bench for weakness, allowing you to OHKO their Latias ex, Basic Shadow Riders, and HARD punishes anyone who still runs GenKyu. Often enough you could take all 6 prizes in one go! However, it serves next to no purpose in literally every other matchup, so only keep it as a potential tech-in option depending on the meta around you. UPDATE: I added a Basic Darkness Energy to the list to help against Shadow Mist and Temple of Sinnoh. 

Alolan Riachu can be annoying, but you should have enough tools to work around it. Hydreigon is immume to damage while it's on the bench, so if you can get that before their "fun turn," there's a very small chance that they'll be able to recover. You also have a banch barrier which can help if they don't have Alolan Muk, but it's still good to have to further slow them down. Vileplume will also pose a problem since they love their items.

Lugia is TBA for the most part, since I haven't tested it against that deck yet. Going off of assumptions, there's a good chance that it will end up as your worst matchup due to it being able to outpace you in the early game if they go second and/or destroy your setup. I'll fill this in if I can get a test done for it.

Good luck!