Mega Sharpedo + Thwackey

This deck combines big damage with unlimited deck search potential.

For this deck, getting goldeen set up with 1-2 thwackeys early will ensure a smooth start. Sharpedo has no retreat cost so the main rotation is: if it starts the turn in active, you can retreat to goldeen, boom boom groove, then promote it back up with pecharunt ex.
Mochi for additional damage when promoted by pecharunt, allowing it to one-tap a few notables like Mega Froslass, Tera Greninja, Mega Zygarde, Mega Kanga,  just to name

This deck combines big damage with unlimited deck search potential.

For this deck, getting goldeen set up with 1-2 thwackeys early will ensure a smooth start. Sharpedo has no retreat cost so the main rotation is: if it starts the turn in active, you can retreat to goldeen, boom boom groove, then promote it back up with pecharunt ex.
Mochi for additional damage when promoted by pecharunt, allowing it to one-tap a few notables like Mega Froslass, Tera Greninja, Mega Zygarde, Mega Kanga,  just to name a few
Yveltal is there for easy cleanups or if you need to stall with retreat lock.
Battle Cage can be subbed for TR Watchtower if needed.
Judge can be subbed for something else as well, i just like the second source of hand disruption since there are many times where the board will be set up and i dont really need anything in particular.

Some single prizers like Alakazam, Slowking, Toucannon, and Crustle offer a bit of a challenge, but does very well against Mega-centric decks like Mega Lucario, Mega Greninja, and Mega Darkrai. It also smashes dark based Sharpedo mirror decks.
Performs well against Dhelmise if you can take KOs and disrupt early to avoid Spiritomb.

Mainly it is just tons of fun to play. Being able to drop 300 per turn while also being able to search out any card and boss at any time as well as having many outs and recovery options.