Celesteela CES (expanded), Gyarados BUS (expanded), Hitmontop LST/Sigilyph PLB/Spell Tag (I think) and Noivern FFI/Noibat BUS are all very cool, interesting, and most importantly- consistent decks. I have decklists for Celesteela and Gyarados somewhere in the deck garage too, I’ll edit this post later with the threads.
Celesteela basically utilizes Electrode-GX to attach to it a few Shield Energy (each one makes it take 10 less damage from attacks) or DCE to attack with Moonraker. With Beast Energy, Fighting Fury Belt, and Dhelmise, it becomes a very powerful attacker very quickly. It’s also able to abuse N because of Electrode-GX, as well as Life Dew if it’s attached to Electrode-GX.
https://www.pokebeach.com/forums/threads/nuclear-celesteela.148601/
Gyarados is a very fast Archie’s deck, and can hit 200 on T1! You basically just discards all your Magikarps, and get Gyarados on the bench us8ng Archie’s Ace in the Hole, then bring it up and attack!
https://www.pokebeach.com/forums/threads/another-gyarados-deck-archie’s-gyarados.148559/
Hitmontop/Sigilyph/Spell Tag is amazingly cool. Hitmontop’s attack switches it (as well as your opponent’s Active Pokémon) with a Sigilyph, with 3-4 Spell Tag attached (you may want to have Float Stone just in case Sigilyph doesn’t die). If Sigilyph dies, the opponent takes a whopping 12-16 damage counters! Coupled with Strong Energy, Muscle Band, Diancie-Mega {*}, and Regirock-EX all boosting Hitmontop’s attack, you can hit some very high numbers pretty quickly.
Noivern/Noibat is incredibly annoying. For one, Noibat has the Agility attack, which coupled with Victini and Memory Energy, is annoying as is, obviously. And even if it fails, there is always a chance you survive the next attack due to Noivern’s Echolocation Ability. So you essentially have 3 coin flips to protect yourself from damage! That, and the deck has Bench hitting capabilities with Boomburst, and can come out of nowhere and hit higher numbers with Noivern BREAK’s Synchro Woofer attack, which, while 150 isn’t exactly a lot, that + Muscle Band + Shrine of Punishment damage can rack up really quickly. That, and Altair’s DRM can also boost Noivern’s attack power.
All of these decks are very fun to play, and I love creating decks like these. They’re all expanded, however, so hopefully you have the cards to play that format.