QC: 3/3
GP: 2/2
With access to both Trick Room and Magic Coat, Cresselia shines against offensive teams, checking Mega Salamence, Rayquaza, Primal Groudon, Ground Arceus, Mewtwo, and Deoxys-A thanks to its great 120 / 120 / 130 bulk. Furthermore, Cresselia has access to Lunar Dance, a rare and useful utility move that prevents Cresselia from being total setup bait by letting it get a teammate in healthy. However, Mega Gengar and Steel-type Pokemon give it a very hard time. Balanced and stall teams, which don't care about Trick Room, run many Pokemon that wall Cresselia. It also lacks a phazing move, which makes it setup bait for any Pokemon running Aromatherapy, Substitute, or Refresh. Finally, Cresselia faces steep competition with Lugia, especially with regards to defensive duties.
[SET]
name: Trick Room
move 1: Trick Room
move 2: Lunar Dance
move 3: Toxic
move 4: Ice Beam / Magic Coat
item: Mental Herb / Rocky Helmet
ability: Levitate
nature: Bold
evs: 252 HP / 252 Def / 4 SpD
[SET COMMENTS]
Moves
========
Trick Room has a strong niche against offensive teams. Lunar Dance allows Cresselia to heal any Pokemon on the player's team but KOes it in the process. Toxic is used to cripple Primal Groudon as well as other Pokemon that can take advantage of Cresselia's lack of offensive power to set up. Ice Beam 2HKOes Mega Salamence and Rayquaza. It also chips away at Pokemon neutral to it and prevents Struggle recoil if Cresselia happens to get crippled by Taunt. Alternatively, Magic Coat bounces back Taunt, status moves, and entry hazards. However, it should only be used instead of Ice Beam if the team has another Mega Salamence check.
Set Details
========
Maximum HP and Defense EVs with a Bold nature maximize Cresselia's physical bulk in order to deal with Primal Groudon, Ground Arceus, and Mega Salamence well. The remaining EVs are invested in Special Defense to offer a negligible amount of help against special attacks such as Primal Groudon's Lava Plume. Mental Herb allows Cresselia to use Trick Room even through a foe's Taunt. Alternatively, Rocky Helmet is a very useful item to inflict chip damage on physically offensive Pokemon such as Mega Salamence and Extreme Killer Arceus. It is also good against Dragon Tail Primal Groudon trying to phaze Cresselia on the switch.
Usage Tips
========
Against hyper offense, Cresselia can only use Trick Room once, so time it well. Also, make sure to keep Cresselia healthy for Mega Salamence and Rayquaza. However, pay attention to Rayquaza because its Choice Band set 2HKOes Cresselia with Dragon Accent. Use Lunar Dance when you don't need Cresselia anymore or when you really need to heal a certain threat's check. Against stall and bulky balanced teams, use your stallbreaker until it's weakened, and then switch it out to heal it later with Cresselia's Lunar Dance. Never use Trick Room against stall teams, as Pokemon on these teams are really slow. Against Xerneas with Aromatherapy or any other Pokemon trying to set up on Cresselia, use Trick Room and then use Lunar Dance to bring in your check to them, especially if it's weakened. Against Taunt users, use Trick Room on the same turn Mental Herb activates, and then use Toxic or switch out. If you opted for Rocky Helmet, make sure to switch Cresselia in on possible contact moves.
Team Options
========
Cresselia shines on balanced and bulky offensive teams. It's especially good with Pokemon that can take advantage of Trick Room like Eruption Primal Groudon, offensive Life Orb Dialga, and Mega Mawile. It should also be paired with strong stallbreakers that can be healed with Lunar Dance such as Perish Trap Mega Gengar and paradancer Primal Groudon. Checks to Xerneas like Primal Groudon, Klefki, and Ho-Oh are mandatory. Finally, switch-ins to Dark-type attacks, such as Klefki and Xerneas, and to Ghost-type attacks, such as Yveltal, should be on the team to patch up Cresselia's weaknesses.
[STRATEGY COMMENTS]
Other Options
=============
A fully defensive set with Moonlight / Toxic / Ice Beam / Protect is decent but outclassed by Lugia. Psychic is an option to hit Mega Gengar hard. A dual screens set with Light Clay is a noteworthy option. Finally, Icy Wind could be used instead of Ice Beam to slow down foes. However, Ice Beam is stronger, and Icy Wind is counterproductive with Trick Room.
Checks and Counters
===================
**Mega Gengar**: Mega Gengar is immune to Toxic and takes little damage from Ice Beam. It will trap Cresselia and KO it.
**Steel-types**: Steel-types, such as Klefki, Bronzong, Ferrothorn, Skarmory, Aegislash, Jirachi, Forretress, and Mega Scizor, are immune to Toxic. They can cripple Cresselia with Toxic or set up entry hazards if it lacks Magic Coat.
**Aromatherapy + Geomancy Xerneas**: Xerneas can set up on Cresselia and rid itself of status with Aromatherapy if Cresselia uses Toxic.
**Refresh and Substitute Users**: Pokemon with these two moves, such as Calm Mind Arceus formes, can set up Substitute on Cresselia and use Refresh if inflicted with Toxic.
**Dark- and Ghost-type Pokemon**: Darkrai, Yveltal and Ghost Arceus can Taunt Cresselia or hit it with super effective STAB attacks.
**Taunt Users**: Mental Herb only works once. After that, Cresselia is totally vulnerable to Taunt.
**Mega Sableye and Mega Diancie**: Mega Sableye and Mega Diancie have Magic Bounce and thus can bounce Toxic back to Cresselia. They also take minimal damage from Ice Beam. It's also important to note that Mega Sableye is slow and thus uses Trick Room to its advantage.
**Defensive Primal Kyogre**: Defensive Primal Kyogre has Rest to heal itself from Toxic, as well as Scald to deal decent damage to Cresselia.
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