[Dark Fallen Angel]

A cool set for Jirachi would be:

Jirachi @ Leftovers
Timid Nature
252 HP / 4 SAtk / 252 Spe
- Substitute
- Calm Mind
- Wish
- Thunderbolt
- Psyshock
- Hidden Power Ice / Hidden Power Fire / Grass Knot

I know that versions of this set were already posted, but this set has a diference. The main coverage options are Thunderbolt and Psyshock. Thunderbolt gives general coverage, nabing a neutral hit on lots of things with Psyshock. Psyshock defeats special walls like Blissey and Chansey, and Fighting-types.

The difference is the last coverage move. Hidden Power Ice is the recommended option to defeat the boring Ground-type Pokémon that counter the normal set, such as Hippowdon, Gliscor and Landorus. As long as Jirachi is behind a Substitute, Hidden Power Ice should maim them, and Hidden Power Ice provides insurance against Dragon-types if Jirachi doesn't have sufficient boosts. Hidden Power Fire can be used to quickly defeat Steel-types like Ferrothorn for example, which resists both Thunderbolt and Psyshock and can tank even +6 hits of both moves. It also gives insurance in case of Jirachi needs a quick way to defeat Scizor if it doesn't have sufficient boosts. Grass Knot is the last option, that can counter one of the main counters to the normal SubCM set: Quagsire. And also maims Gastrodon and Swampert much more quickly than Psyshock.

It's possible to use both Hidden Power and Grass Knot by dropping Wish, but this isn't recommended as Jirachi loses an important recovery move that can also support its teammates.

Also, a version of the Heatran Weather Trapper:

Heatran @ Air Balloon
Timid Nature
4 HP / 252 SAtk / 252 Spe
- Sunny Day
- Magma Storm
- Solarbeam
- Earth Power
- Hidden Power Ice
- Flamethrower / Fire Blast

This can trap not only weather starters, but can also trap many things. Now that you have six moves, you can run both Earth Power and Hidden Power Ice and trap both dragons and weather starters, and also have a way to defeat opposing Heatran. The six moves also let you use Flamethrower as the last option. It is less powerful than Magma Storm but is much more accurate and useful for late-game cleaning, Fire Blast can also be used for more power but it's still very innacurate, albeit more accurate than Magma Storm, still Flamethrower is the recommended option.

Tyranitar @ Choice Scarf
Jolly Nature
4 HP / 252 Atk / 252 Spe
- Stone Edge
- Crunch
- Pursuit
- Superpower
- Ice Punch
- Fire Punch

With two more moveslots, Scarf Tyranitar can now run Ice Punch and Fire Punch as coverage options. A 2x super effective Ice Punch is as powerful as a neutral Stone Edge, the same applies to Fire Punch, however, both punches are used instead so that Tyranitar doesn't have to rely on the shaky accuracy of Stone Edge. Ice Punch also lets Tyranitar revenge kill Gliscor and non-Choice Scarf and non-Rock Polish Landorus, as well as some dragons that haven't a boost on their Speed. Fire Punch is a better option to use against Ferrothorn than Superpower, because it leaves a larger dent, and is a better option than Superpower in two situations; If you want to stay in, or if the Steel-type in question is neutral to Fighting. It also lets Tyranitar revenge kill weakened Jirachi. Note that even Fire Punch fails to 2HKO Skarmory.