That's a nice idea, but then again, having to wait 3 turns when most can be one shotted if you got the right attack may not be that efficient... I've found an even more broken battle strategy for online doubles/battle tree doubles if you are interested, Role Play Stakataka with Regigigas (or Skill Swap with any broken mon like mega Rayquaza or Ultra Necrozma)!
Using the Stakataka with Role Play I give Beast Boost to Regigigas (Brave) on first turn, then on second I use Trick Room and start spamming Gyro Ball (which still does a ton) and Regigigas just focuses on attacking with an Assault Vest set with Drain Punch, Heavy Slam, Knock Off and Ice Punch. You can replace Knock Off with Earthquake but you have to use Protect/Magnet Rise as Stakataka's last move (I go with Zen Headbutt for Fighting mons and Chople Berry). With this combo, I'm already at 63 wins in super doubles on the battle tree! Other two mons I have in the back is Regirock (Sassy, max HP/sp.def. with Drain Punch, Z-Curse, Rock Slide and Facade) and Slaking (never had to use it so far, but I do same thing as with Regigigas).
I accidentally selected singles online and used that team (Ultra Necrozma over Slaking though). Woops, but I swept two mons with Stakataka, trainer busts out U-Necrozma as well, Gyro Ball puts it in the red. So one more move to win, right? Okay, Regirock with that set, a Rock Slide for the win. No, it fucking misses! I don't know if the trainer guessed that the Regirock had Sturdy, because he used Flash Cannon before finishing off with Light That Burns The Sky. GAH! Fuck, see that's what pisses me off. I don't get being pissed off at someone who gens, be mad at the game, a miss that mattered. I'll try doubles next, but fucking Hell.
And I have history with mistakes in Pokemon leading to good things. I prepped a Steel Monotype team on Showdown (before USUM) but at the last minute found out that Kartana's banned. So I replaced one of the mons and went into OU and had the best success in there than ever before. Granted, I still lost, but I made it up to the low 1300s, which is so rare for me. I'll share it.
Painkiller (Kartana) @ Focus Sash
Ability: Beast Boost
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Night Slash
- Leaf Blade
- Smart Strike
- Sacred Sword
Nightcrawler (Skarmory) @ Leftovers
Ability: Sturdy
EVs: 224 HP / 252 Def / 32 Spe
Impish Nature
- Brave Bird
- Roost
- Whirlwind
- Defog
Hammerin Anvil (Ferrothorn) @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 68 Def / 188 SpD
Relaxed Nature
IVs: 0 Spe
- Leech Seed
- Protect
- Gyro Ball
- Spikes
Metal Meltdown (Heatran) @ Air Balloon
Ability: Flash Fire
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Magma Storm
- Earth Power
- Taunt
- Stealth Rock
Touch Of Evil (Zygarde) @ Choice Band
Ability: Aura Break
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Thousand Arrows
- Extreme Speed
- Outrage
- Toxic
All Guns Blazing (Magearna) @ Fairium Z
Ability: Soul-Heart
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Shift Gear
- Fleur Cannon
- Thunderbolt
- Focus Blast