Not to be a downer, but 3 of the 4 submissions/reserves so far aren't what I'd consider a lure. A lure is a pokemon that the victim would switch into, believing it can 1v1 it, only to be surprised by an abnormality in its set that can turn the tables. Kommo-o is a fighting type that is immune to sludge bomb and Focus Miss, and can OHKO Darkrai. Hisuian Goodra is an infamously good special wall that commonly runs Assault Vest, and so no Darkrai user would believe they could break past it without dying to Body Press first. As for Iron Valiant, I shouldn't really need to explain why Darkrai would never swap into it.
Again, no hate to the users who submitted the aforementioned sets. Just a little reminder that these sets are more suitable for the "Victims of the Week" forum.
Anyways, here's my submission:
Necrozma @ Weakness Policy
Ability: Prism Armor
Tera Type: Ground
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Dance
- X-Scissor
- Photon Geyser
- Earthquake
Necrozma is one of the returning legendaries in the Indigo Disc DLC. Whilst Ubers is likely going to love the return of Dusk-Mane-Necrozma, and UUbers may appreciate Dawn-Wings-Necrozma, base Necrozma has always been overlooked as a lower tier mon that is simply outclassed as a psychic type attacker by pokemon such as Iron Boulder or Metagross.
That said, Necrozma has got a pretty mean special attack stat of 127. So any opponent, upon seeing it in team preview, would be wise to fear a possible Calm Mind set. Upon inspecting their own team, they would recognise Darkrai as a very effective swap in, due to a lack of Focus Blast in Necrozma's movepool.
252+ SpA Necrozma Heat Wave vs. 0 HP / 4 SpD Darkrai: 122-144 (43.4 - 51.2%) -- 5.9% chance to 2HKO
^This is the most damage that a Necrozma could do if they somehow managed to predict the Darkrai switch-in, which is nowhere near sufficient considering the slightest bit of chip damage would guarantee Darkrai to KO in response.
252 SpA Life Orb Darkrai Dark Pulse vs. 0 HP / 4 SpD Prism Armor Necrozma: 289-341 (86.2 - 101.7%) -- 12.5% chance to OHKO
Adding on the 30% chance that Dark Pulse has to flinch, alongside the likelihood that Necrozma will simply Calm Mind or Photon Geyser, Darkrai is a very nice Necrozma swap in. So that's why we're going to take advantage of Necrozma's base 107 physical attack to surprise the former Uber.
+1 252+ Atk Necrozma X-Scissor vs. 0 HP / 0 Def Darkrai: 274-324 (97.5 - 115.3%) -- 81.3% chance to OHKO
The idea is simple. We can Dragon Dance as the Necrozma swaps in. Thanks to Necrozma's Prism Armour, this is unlikely to be a risky move, especially if we scare out whatever's in front of us. At +1, a max speed Necrozma barely outspeeds a max speed Darkrai (by only 2 points). Even after seeing the Dragon Dance, Darkrai is likely to just Dark Pulse for the damage instead of letting Necrozma set up further. After all, who would expect the X-Scissor? Even if we miss out on the KO (which is very unlikely) and Darkrai gets the OHKO (also unlikely), the Life Orb recoil will take out Darkrai, completing the lure.
So that's the basic plan for killing Darkrai, but it gets better. Another common Darkrai set is Choice Scarf, and this Necrozma beats those too. Even if it gets surprised by the Darkrai outspeeding it after a Dragon Dance, the lack of a Life Orb means Necrozma is guaranteed to survive the incoming Dark Pulse, which would activate its weakness policy and guarantee the following KO. Now we have a +3 Necrozma staring down the enemy team, with Tera Ground to boost Earthquakes against Steel types.
TLDR:
Necrozma baits in Darkrai, who is expecting a special set, only to Dragon Dance up, ready to outspeed and KO it. This would ideally end with a full health, boosted Necrozma facing down the enemy team, but in the worst case we can still bring down Darkrai.
Again, no hate to the users who submitted the aforementioned sets. Just a little reminder that these sets are more suitable for the "Victims of the Week" forum.
Anyways, here's my submission:
Necrozma @ Weakness Policy
Ability: Prism Armor
Tera Type: Ground
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Dance
- X-Scissor
- Photon Geyser
- Earthquake
Necrozma is one of the returning legendaries in the Indigo Disc DLC. Whilst Ubers is likely going to love the return of Dusk-Mane-Necrozma, and UUbers may appreciate Dawn-Wings-Necrozma, base Necrozma has always been overlooked as a lower tier mon that is simply outclassed as a psychic type attacker by pokemon such as Iron Boulder or Metagross.
That said, Necrozma has got a pretty mean special attack stat of 127. So any opponent, upon seeing it in team preview, would be wise to fear a possible Calm Mind set. Upon inspecting their own team, they would recognise Darkrai as a very effective swap in, due to a lack of Focus Blast in Necrozma's movepool.
252+ SpA Necrozma Heat Wave vs. 0 HP / 4 SpD Darkrai: 122-144 (43.4 - 51.2%) -- 5.9% chance to 2HKO
^This is the most damage that a Necrozma could do if they somehow managed to predict the Darkrai switch-in, which is nowhere near sufficient considering the slightest bit of chip damage would guarantee Darkrai to KO in response.
252 SpA Life Orb Darkrai Dark Pulse vs. 0 HP / 4 SpD Prism Armor Necrozma: 289-341 (86.2 - 101.7%) -- 12.5% chance to OHKO
Adding on the 30% chance that Dark Pulse has to flinch, alongside the likelihood that Necrozma will simply Calm Mind or Photon Geyser, Darkrai is a very nice Necrozma swap in. So that's why we're going to take advantage of Necrozma's base 107 physical attack to surprise the former Uber.
+1 252+ Atk Necrozma X-Scissor vs. 0 HP / 0 Def Darkrai: 274-324 (97.5 - 115.3%) -- 81.3% chance to OHKO
The idea is simple. We can Dragon Dance as the Necrozma swaps in. Thanks to Necrozma's Prism Armour, this is unlikely to be a risky move, especially if we scare out whatever's in front of us. At +1, a max speed Necrozma barely outspeeds a max speed Darkrai (by only 2 points). Even after seeing the Dragon Dance, Darkrai is likely to just Dark Pulse for the damage instead of letting Necrozma set up further. After all, who would expect the X-Scissor? Even if we miss out on the KO (which is very unlikely) and Darkrai gets the OHKO (also unlikely), the Life Orb recoil will take out Darkrai, completing the lure.
So that's the basic plan for killing Darkrai, but it gets better. Another common Darkrai set is Choice Scarf, and this Necrozma beats those too. Even if it gets surprised by the Darkrai outspeeding it after a Dragon Dance, the lack of a Life Orb means Necrozma is guaranteed to survive the incoming Dark Pulse, which would activate its weakness policy and guarantee the following KO. Now we have a +3 Necrozma staring down the enemy team, with Tera Ground to boost Earthquakes against Steel types.
TLDR:
Necrozma baits in Darkrai, who is expecting a special set, only to Dragon Dance up, ready to outspeed and KO it. This would ideally end with a full health, boosted Necrozma facing down the enemy team, but in the worst case we can still bring down Darkrai.
has miraculous base 130 SpD, but the average 
player won't know all of the stats of lower tier pokemon, so you can hopefully surprise them when their super effective Sludge Bomb does...
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