I got top 10 in the ladder using a team with offensive z-poison Roselia and works pretty well.Getting this thread started with a slightly controversial nomination but one that I believe there's enough support behind to make this post worthwhile
Nominating Roselia for S:
In my very large amount of time playing NFE (so long I don't even remember who invited me to it and long enough to go through 3 different tier leaders) I've witnessed the rise of Roselia as the premier check to certain threats as well as the premier spike setter of NFE. I wont talk about Roselia's performance in previous iterations of the meta as that doesn't apply to it currently.
The most important aspect of Roselia's viability is its access to spikes. In a metagame as slow and bulky as NFE currently is, the damage done my spikes is monumental, especially with the majority of Pokemon not having access to a recovery move barring rest. Spikes are what set Roselia apart from almost every other grass type in the meta. Quilladin and Ferroseed also have access to spikes but do not provide other things that Roselia does
What pushes Roselia above and beyond in my opinion is its ability to counter Servine and non-specially defensive Clefairy thanks to its defensive typing and impressive base 80 special defense stat in conjunction with its base 100 special attack.
Vs. Servine Roselia is able to come in on a leaf storm and 3hko the common specially defensive spread with sludge bomb while servine is unable to beat it with even a +6 hidden power fire
0 SpA Roselia Sludge Bomb vs. 180 HP / 252+ SpD Eviolite Servine: 114-134 (37.2 - 43.7%) -- guaranteed 3HKO
4 SpA Contrary Servine Leaf Storm over 3 turns vs. 32 HP / 252+ SpD Eviolite Roselia: 76-90 (30.5 - 36.1%) -- not a KO
+6 4 SpA Servine Hidden Power Fire vs. 32 HP / 252+ SpD Eviolite Roselia: 128-152 (51.4 - 61%) -- guaranteed 2HKO
The Roselia spread I used in these calcs runs 220 speed evs in order to outspeed this specific Servine Spread, a set without these speed evs means taking even less damage from Servine but also allows it to heal with synthesis before Roselia attacks it.
Vs. non-specially defensive variants of Clefairy Roselia does the same thing, though it's a 2hko if the clef is at +0.
0 SpA Roselia Sludge Bomb vs. 252 HP / 4 SpD Eviolite Clefairy: 186-218 (54 - 63.3%) -- guaranteed 2HKO
0 SpA Roselia Sludge Bomb vs. +1 252 HP / 4 SpD Eviolite Clefairy: 122-146 (35.4 - 42.4%) -- guaranteed 3HKO
Unfortunately specially defensive Clefairy is able to 1v1 Roselia much more consistently than the physically defensive variants, though these spreads have worse matchups with other common threats that Roselia can easily be paired with like Machoke and Grimer-Alola.
Overall, I believe that the massive amount of support Roselia provides via spikes in addition to its reliability as a Servine counter and Clefairy check push it above the other Pokemon in A+ and into S Rank.
252+ SpA is practically able to break through 252+ SpD eviolite Clefairy with a 2HKO without using your Z-move, and is possible to break through Togetic too, with the z-move followed up by a sludge bomb guarantees a 2HKO. Not SpD invested Clefairy and Togetic will easily be 0HKO by the z-move and take a lot from sludge bomb, being unable to Softboiled/Roost stall.
252+ SpA Roselia Sludge Bomb vs. 252 HP / 252+ SpD Eviolite Clefairy: 168-200 (48.8 - 58.1%) -- 96.9% chance to 2HKO
Using the z destroys clef even after a calm mind, confirming a solid 2HKO
252+ SpA Roselia Acid Downpour (175 BP) vs. +1 252 HP / 252+ SpD Eviolite Clefairy: 218-260 (63.3 - 75.5%) -- guaranteed 2HKO
252+ SpA Roselia Acid Downpour (175 BP) vs. 252 HP / 252+ SpD Eviolite Clefairy: 330-390 (95.9 - 113.3%) -- 75% chance to OHKO
252+ SpA Roselia Sludge Bomb vs. 252 HP / 0 SpD Eviolite Clefairy: 254-302 (73.8 - 87.7%) -- guaranteed 2HKO
252+ SpA Roselia Acid Downpour (175 BP) vs. 252 HP / 0 SpD Eviolite Clefairy: 494-584 (143.6 - 169.7%) -- guaranteed OHKO
252+ SpA Roselia Acid Downpour (175 BP) vs. 252 HP / 252+ SpD Eviolite Togetic: 242-288 (77 - 91.7%) -- guaranteed 2HKO
252+ SpA Roselia Acid Downpour (175 BP) vs. 252 HP / 0 SpD Eviolite Togetic: 336-396 (107 - 126.1%) -- guaranteed OHKO
This set runs 252 SpA to be able to hit hard, not only the fairy types, but almost every Pokémon in the tier thanks to the solid base 100 SpA. Giga Drain coverage makes able to hit ground/rock types with a super effective STAB move and get a little health back after soaking up hits. A good way to use this set is baiting the fairy types, because mostly (I can say all) Roselias are defensive and struggle to break through this walls. The speed on this build is 252 invested to have a good speed to attempt to use your z-move first when possible.
Access to spikes allows Roselia to raises her pressure along game while your opponent is switching in. Another good point is that Roselia is great against almost every single spinner in the tier, making this mon very strong.
Synthesis for reliable recovery and longevity makes Roselia a huge threat able to tank hits and heal up.
Natural cure is to Roselia be able to switch into scald with no problems getting burn or being paralyzed after a Thunderbolt
The lack of eviolite and Hp/SpD investment makes it harder to use her to checks some offensive pokémons in the meta. Roselia, in this set is kinda glass cannon but her offensive presence is great and is still able so switch in not very effective moves.
Who to run with this Roselia build:
Knock off users like Machoke, Krokorok and Pawniard to remove eviolites, opening a door to Roselia hit harder. All three have a good synergy with Roselia but Pawniard is a great option doe to the fact he can Pursuit trap Kadabra and Haunter, or even scary with a sucker punch. He is also a Defog blocker with it's Defiant ability, since Roselia has access to spikes and toxic spikes, you can abuse that advantage. Machoke can break through steel stypes like Lairon, which Roselia struggles dealing with and Roselia can switch in fairy moves to Machoke.
Krokorok is a solid Stealth Rock setter with access to Knock off support. He is also a good Scarf user, being able to Pursuit trap Kadabra and Haunter, which threatens Roselia.
Frogadier, hard countered by both fairy types mentioned (Clefairy and Togetic), has a good space when you can deal with them. Frogadier is a strong pivot, able to u-turn around and keep the momentum to bring in Roselia.
Monferno is not only a great pivot with choice scarf but a good Stealth Rock setter when running sash lead or eviolite. Monferno is a pretty strong option, Roselia can remove not only the fairy types but the water types too, like Wartotle and Marshtomp, opening a huge door for Monferno. He is also able to remove steel types to Roselia and threats Kadabra with u-turn if it's scarf.
Roselia @ Poisonium Z
Ability: Natural Cure
EVs: 252 SpA / 4 SpD / 252 Spe
IVs: 0 Atk
- Sludge Bomb
- Giga Drain