Yes Rico, KABOOM. | Unlimited Dusclops

This is an unlimited deck! It will end up using Dusclops as a method to KO all of your opponent's Pokemon in play before they can take a turn. This isn't my first Turn one deck, but the overarching strategy is the same. the instructions on what to do exactly are a bit length, so bear with me!

The first part is simple, but the most luck-based. If you're not already going first, open with Sableye to assure that you go first. I've minimized the number of other basic Pokemon in the deck to

This is an unlimited deck! It will end up using Dusclops as a method to KO all of your opponent's Pokemon in play before they can take a turn. This isn't my first Turn one deck, but the overarching strategy is the same. the instructions on what to do exactly are a bit length, so bear with me!

The first part is simple, but the most luck-based. If you're not already going first, open with Sableye to assure that you go first. I've minimized the number of other basic Pokemon in the deck to give the highest chance of opening with one. Mulligans shouldn't matter because if you successfully pull this off, your opponent would have lost before their first turn. Your other option to rig the turn order is First Ticket (Dragon Vault), but I believe that Sableye gets priority since it's revealed after the effects of First Ticket, thus rewritng the order again. The only way it makes a difference is if you play both that and Sableye at the same time, since both players having one as their active at the beginning of the game nullfies the ability. You could run 4 tickets in addition to 4 Sableyes if you want, but you'll be sacrificing in-game consistency to up your chances of going first. 

Next, you want to check your starting hand. You want to get Broken Time-Space into play as fast as you can, as you want to get your Pokemon to evolve quickly. From there, you want to get all of your basic Pokemon into play, except for your other copies of Sableye, as it's not needed anymore. Use any other copies of it as discard fodder from now on. You have access to a ton of cards to help you search for what you need, so you shouldn't have many worries getting what you require. A complete bench would have Porygon and Duskull on it. If anything you need is prized, you have Rotom Dex and Hisuian Heavy Ball to help you out.

After, you want to evolve your Porygon. Its ability (well, Poke-Power) lets you effectively play a supporter card even if you're going first, so you can use it to play Lysandre's Trump Card and recycle all of your resources that you've used. Be mindful of the fact that when you play it, you need to have an out to keep going, because when testing, I've found myself running out of steam and bricking as soon as I play LTC. So, in order to prevent that, you can use Item Finder to give yourself the second half of Poke Drawer + or Misty's Wrath to get yourself going again.

Now you're in the final stretch! Take your Duskull and evolve it into Dusclops, and then use its ability so it can KO itself and place 5 damage counters on one of your opponent's Pokemon. After that, play Rescue Carrier to put the entire line back into your hand and repeat the combo! If you manage to KO all of your opponent's Pokemon in play, then you just win!  

Life Dew is really only needed if your opponent happens to have more than 300 combined HP on their board, which is unlikely, but not impossible! If you need to explode a ghost more than 5 times, make sure you start using Life Dew to stop giving up prize cards and not lose the game on the spot. If you run out of Resuce Carriers, use Porygon2 to Download Lysandre's Trump card.

Enjoy!