Gengar
Gengar is so frail it won't be able to take a hit from 75% of the Pokémon in the Battle Tree, so give it this spread instead: 252 Spe, 252 SpA, 4 SpD. :P
Dazzling Gleam and Dark Pulse aren't great compared to Shadow Ball and Sludge Wave; if you wanted to stall by flinching, Gengar is not the greatest for that as it can't take a hit, and a 20% chance won't make you succeed across 50 or more battles. It is a little unreliable, and Shadow Ball covers the same types and does way more Damage with STAB. :P
Tyranitar
Using Scarfed Tyranitar without speed investment isn't a great choice. It would do much better with this spread: 252 Atk, 220 Spe, 36 Def. 220 Spe allows it to out speed Base 110 with 252+ EVs. :P
Earthquake has similar Coverage to Brick Break and Stone Edge, so it should be replaced with Crunch for powerful STAB coverage. :P
Brick Break is too weak and will be used rarely, so you should use Superpower instead. You can switch out to reset the stat debuffs, which is common with Choice users anyways. :P
Turtonator
Don't use Turtonator.
Since you plan to use a Turtonator similarly to a Toxapex, I recommend Toxapex. Something like this should work:
Toxapex @ Black Sludge
Ability: Regenerator
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Haze
- Scald
- Toxic
- Recover
Toxic is for killing most things, most notably Speed Boost Blaziken. Toxapex needs HP EVs for Bulk and the Defense EVs make it a wall. Scald is for damage and burning Toxic immune Pokémon. Recover allows you to heal and stall. Haze allows you to shut down Boosted sweepers that may show up.
That is what I think. You don't have to listen to my advice exactly if you don't want to. :P
Either way, Good Luck! Have fun. I hope I Helped!
