Yet another random set:
Star (Jirachi) @ Salac Berry / Leftovers
Ability: Serene Grace
EVs: 68 HP / 252 SpA / 240 Spe
Timid Nature
- Doom Desire
- Wish
- Cosmic Power / Calm Mind
- Psyshock
Explanation:
-Setting up wish when you expect to hit a pinch with your berry as it heals up takes a ton of skilled timing, so you may use a Leftovers. Using either Calm Mind or Cosmic Power will toughen up the star. Doom Desire to literally force them to switch the turn it hits (to something that may wall it), then switch to an Anti-Wall at the same time. Psyshock is there to take care of nuisances like Eviolite Lucky or Light Screen Hapinasu.
-The ability is sadly unused by this set.
Another one:
Nuisance (Jirachi) @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 4 Atk / 252 Spe
Jolly Nature
- Body Slam / Thunder Wave
- Iron Head / Zen Headbutt
- Wish
- Cosmic Power
Explanation:
-You don't need to hit hard, with this ParaFlinch strategy. Set up with a Wish and Cosmic Power to become tougher, then start the show by paralyzing targets then spamming your flinch move of choice. Since they are paralyzed, they'll suffer and force switch, which where your wish may come handy as you may outplay your target by switching as well (most probably, they'll send a ground/fire type, so bring in a water type). This set is a standard with Jirachi though.
And yet another one (Gen 8 Sandstorm Support/Sweeper):
Blep (Jirachi) @Power Herb
Ability: Serene Grace
EVs: 124 Atk / 252 SpA / 128 Spe
Naive Nature
- Sandstorm
- Meteor Beam
- Fire Punch
- Aura Sphere
Explanation:
-Sandstorm increases Special Defense of Rock-Types by 50%, which is good to support allies. Most importantly, despite having no stab, this moveset can cover all types without any being resistant. Fire Punch may surprise burn your targets so it comes handy, Aura Sphere to destroy enemy Rock and Steel types who think they can join your fun, Meteor Beam with Power Herb further boosts your nuisance, as well as your Special Attack.
-I chose naive nature since Jirachi can't use a special Fire-Type attack (which is why I opt to Fire Punch), and yes. You may use Timid Nature, but it drops the power of Fire Punch, but... I will never opt to a neutral nature because that suck. Meteor Beam is available at a Move Tutor, so make sure you teach it with it, as it gets handy in increasing Sp.Atk (and that serious power is creepy), Aura Sphere never misses, so it's a classic move.
Physical Version of the Sandstorm Support/Sweeper:
Blep 2.0 (Jirachi) @ Smooth Rock / Life Orb
Ability: Serene Grace | Jolly Nature | EVs: 252 Spe, 252 Atk, 4 HP
EVs: 4 HP / 252 Atk / 252 Spe
- Sandstorm / Ice Punch
- Fire Punch / Thunder Punch / Ice Punch
- Iron Head / Meteor Mash / Zen Headbutt
- Drain Punch
Explanation
-Sandstorm is the purpose of this set. Fire/Thunder/Ice Punch is coverage, based on your desire. Thunder Punch is the most recommended (as only electric type Pokemon will be left resistant to you, and it's a sandstorm team, who sends out an electric type during a sandstorm anyways?), Iron Head/Meteor Mash is stab and might clean nasty fairy/ice types who tend to counter your team (meteor mash might boost your attack lmao). Drain Punch will prevent enemies from joining your sandstorm party, unless they're Ground-Types (probably covered by Ice Punch if you use it).
-You may also turn this to a sweeper if you replace sandstorm with Ice Punch, if you have a different sandstorm setter.