SR Jirachi was already offered as an alternative to SR Metagross, but I'd like to offer another alternative that can overcome some of Metagross's downfalls that Jirachi can't, while also being a better analogue to Metagross's old role rather than being something completely different.
Don't use this:
Metagross @ Leftovers
Trait: Clear Body
EVs: 252 HP / 96 Atk / 160 SDef
Adamant Nature
- Stealth Rock
- Meteor Mash
- Pursuit
- Earthquake / Hammer Arm
Why it's bad: Metagross has a ton of issues that prevent it from being ideal in the current metagame, the two main ones being that it's easily worn down and that its coverage is very awkward, always leaving more to be desired. For example, the set above (listed on site) has trouble with bulky waters, Thundurus-T, Skarm, and Volcarona. Sure you can swap out one of your current coverage moves for ice punch, thunder punch, or rock slide to help cover those threats, but just needing all of those options on top of what it already has shows how bad Metagross is as an offensive SR setter. I won't knock Agiligross or other offensive Metagross sets, but there are so many better offensive and defensive mons you can fit rocks onto. If you really need a steel type to set up rocks and check dragons that's not weak to fighting, you can
Use this:
Bronzong @ Leftovers
Trait: Levitate
EVs: 252 HP / 168 Def / 88 SDef
Sassy Nature
IVs: 2 Spd
- Stealth Rock
- Gyro Ball
- Hidden Power [Ice]
- Earthquake / Toxic
Why it's better: With levitate, Bronzong cannot be worn down by spikes, increasing its survivability a ton. Its ground immunity lets it handle dragons much better, allowing it to switch into physical dragons not locked into outrage directly, unlike Metagross. And on top of that, you are no longer Lando-T's bitch; you make it yours quite easily. Gyro ball and HP ice allow Bronzong to check a number of offensive threats effectively, and earthquake is there to hit your opponent's steels. I prefer toxic in the last slot though, as even with earthquake, Bronzong fares poorly against Tentacruel, Toxicroak, Ferrothorn, and Heatran. Toxic is great for luring and dealing with your opponent's bulky waters as they try to burn you. By changing your SR setter from Metagross to Bronzong, you essentially trade crappy coverage for more specialized (still not great) coverage and much more utility, which is well worth it in my opinion.