Straightforward team with a hidden gimmick that's a ton of fun to use. Salamence, Jirachi, Heatran and Koko are all in the team pretty much just because they are top-tier mons that you can't go wrong using, even though the team thus far is basically "Loses to Landorus: The Team":
- Salamence: I like mixed Salamence with Tailwind, so that's what I went with since I wanted a solid speed control option. It's just a standard 4 Atk / 252 SpA / 252+ Spe spread; Double Edge still kills what it needs to, Hyper Voice is powered up to the max, and Salamence still hits the speed benchmark it's supposed to.
- Jirachi: Tbh, I just use the ORAS analysis spread since it already lives a Modest 252+ Charizard Y Heat Wave in sun, which seems to be what most people benchmark for. I could potentially drop Def for Spe investment to outspeed and flinch Heatrans, but this team doesn't really need that, so I just kept the Def. Sitrus > Goggles because what's an Amoonguss anymore? + I have two Tapus that negate sleep + I have enough mons that kill it.
- Tapu Koko: Literally just the standard Koko set. Pretty self-explanitory.
- Heatran: Grassium Z Bloom Doom Tran to lure Water-type mons for the kill. I like Timid for the Heatran mirrors and b/c not as many people EV for Timid tran, but go Modest if you want. A simple 4 / 252 / 252 spread works since I'm not running sub; Lando Rock Slides doing > 25% doesn't really matter on this set.
Okay, so
here's where the team gets fun. The next two mons form a sort of gimmicky core, yet it's completely functional without this said gimmick.
- Genesect: As I said above, the team thus far pretty much clicks X against Lando, so that needs to be patched up. Max-Spe Scarf Genesect outruns Timid Lando and kills with Ice Beam. It also runs Iron Head and U-Turn for STAB, notably helping out against Lele spam and Bulu (Gunk Shot is also a nice alternative option if you want to lure and kill Koko and Fini). Okay, so here's the defining feature of my team: Genesect's fourth move is Simple Beam, and it can literally help Tapu Fini win games. It's recommended to use Simple Beam on Fini when you can force a switch by bluffing another move (eg. bluffing Ice Beam on Lando/Mence, or bluffing Iron head on Tapu Lele). It's important not to get greedy; as fun as Simple Beam is, there are still times where it's better just to attack, since CM Fini is already good on its own...which brings me to:
- Tapu Fini: This is my take on Calm Mind Fini. Using it is pretty straightforward, and if you get the chance to Simple Beam it, all the better :D
My EV spread accomplishes the following:
- Outspeeds Timid 252 Spe Heatran to avoid being lured and hit by Bloom Doom
- Dumps 252 EVs into Def, since you'll be building up SpD through Calm Mind
- Rest in HP for more bulk, since your SpA will also come from Calm Mind