Evil Incarnate

You, too can be that guy. The one with the really annoying deck no-one wants to play against.

Opponents rage quit. They time out. They deck out.

Sometimes they win - if they realize Meganium and Noctowl also have attacks.

Such fun!

Mimikyu is your main attacker. No ex cards can do anything to it (save Mew ex). (And Alolan Exegguter ex).
Toesdscruel makes sure everything that is dead stays dead. Nothing goes from the discard pile into the hand. 
Evolve Misdreavous to bump an energy from the opponent's

You, too can be that guy. The one with the really annoying deck no-one wants to play against.

Opponents rage quit. They time out. They deck out.

Sometimes they win - if they realize Meganium and Noctowl also have attacks.

Such fun!

Mimikyu is your main attacker. No ex cards can do anything to it (save Mew ex). (And Alolan Exegguter ex).
Toesdscruel makes sure everything that is dead stays dead. Nothing goes from the discard pile into the hand. 
Evolve Misdreavous to bump an energy from the opponent's active Pokémon to something useless, like Bidew or Clefey or Squackabilly ex. Then devolve with Strange Timepiece and repeat next turn.
Use Iron Bundle to gust.
Use Eri to grab opponent's supporters and put them in the Toedscruel-locked discard tomb.
Use Xerosic's Machinations and Hand Trimmer to send more cards to the same place.
Use Neuralization Zone late in the game to prevent all ex attacks.
Lisia's Appeal is a Boss's Orders that works on Basic Pokémon only, but she confuses them. Great for grabbing that Hoot-Hoot or Chikorita early before they become a menace.

Some decks do better against it (of course), such as single prize decks like Rotom Box, or specific decks like Mega Venusaur ex because of Solar Transfer. PAF Charmelion with Flare Veil will destroy this deck if the opponent figures out the trick in time. So this deck won't rise through the ranks or ever become meta. But it's still real fun to play.

It started out as a deck by Cinnabar's Collectables on YouTube (named "Evil,") but I've really morphed it into one of the most annoying decks I've found.

Have Fun!