Done Necturna in Gen 9 Revisit

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Alrighty CAP, lets talk about Necturna... again

Necturna has been a thorn in our side (pun entirely intended) for several gens and iterations of those gens now. The changes to Egg Moves starting in ORAS forced us to implement Necturna Clause, which limited Necturna's options to one Sketch move per set. This becomes a problem in SM due to a variety of back-end factors, formally forcing us to implement Sketch as an Egg Move. Effectively, starting in SM, Necturna Clause is not cart replicable.

Additionally, the changes to how transfer moves work both in SS and SV have made dealing with Necturna in recent gens increasingly more of a headache. Sketch was unavailable entirely in SS, as Smeargle was not present in the game, and transferring moves from SM and prior into SV would render moves such as Sketch unusable. Necturna was able to get around this by "sketching" moves in SM or another old gen, and transferring the post-sketch move up through into SS. This meant that Nect was unable to sketch anything new that was added in SS, and it makes SS's Necturna Clause subject to the same issues with SM's non-cart replicable implementation. In SV, Nect was actually in worse shape prior to the release of the Indigo Disk. Moves could not be transferred up between SS and SV at all, meaning there effectively are no transfer moves: Nect lost the entirety of its sketch movepool. This led us as a community to go as far as to add Shell Smash, its most commonly sketched (and available) move, to its base moveset as we awaited Sketch's return. Smeargle returned in the second set of DLC, and with it Sketch, meaning that Nect not only on-paper has its almost full movepool back, but also anything new from SS and SV that exists in the current iteration of SV.

Necturna raises an interesting question, and we wanted to push it to PRC to hear from what the community thinks about this dilemma. It presents very unique difficulties, most notably Necturna Clause and its interaction with transfer moves. Is Necturna Clause, a clause that breaks existing game mechanics, something we want to have existing in our format? Does our post-Gen 4 rule avoiding custom content and changing the laws/rules of the game (here, Necturna Clause) override our commitment to any individual CAP's concept (Necturna's defining feature of Sketching exclusively once)? Is there a serious issue with the future-proofing of Necturna now that transfers effectively don't work, and we would continually have to update and change the mon? We wanted to open up the floor to the community at large to discuss.
 
The headache surrounding Necturna clause goes much deeper than the OP highlights.

In the past, CAP never updated movepools between generations. We relied on "transfer moves" for old pokemon to maintain their learnsets. For example, Fidgit's movepool is defined for DPP but goes untouched until SM. This allowed us to preserve the single-learn sketch mechanics from Gen 5 with ease.

The OP also doesn't highlight the unstable nature of Nectura Clause's current implementation. When we added Shell Smash in Gen 9 updates, the move was back-ported across the generations because of an oversight in the code. Necturna Clause was only checking that Necturna could naturally learn a move at some point and not that a move was available in a specific generation. This ultimately gave us this infamous replay of Shell Smash + Stored Power Necturna in SM: [Gen 7] CAP: Piyush21 vs. Luna's Bann3d Now - Replays - Pokémon Showdown! (pokemonshowdown.com). There are likely other bugs that have yet to surface in the existing code.

The continued maintenance of Necturna Clause directly contradicts fundamental policies: No Custom Mechanics. If the desired functionality cannot be found on cart, we shouldn't force it to exist. We have accepted this with other CAPs. Crucibelle lost its Mega post-SM. If legendary exclusive moves are unavailable, Equilibra and Saharaja will go without the concept-defining elements until they return. We should treat Necturna in the same way.

Necturna should only get Sketch back if there is an on-cart mechanic that replicates learning a move once AND Sketch is available.
 
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Once a year I see someone bring up "Necturna Clause" in the CAP Discord and each time I explain how it is both pointless as a concept and was never implemented as a clause to begin with. The only reason the sim had any code at all to prevent Necturna from having multiple Sketch moves is because of how the validator worked prior to Necturna even being implemented; Pokemon with Sketch in their learnset can select any move in the teambuilder and any number of those moves are valid, and the Necturna line was an exception to this (because it can only learn Sketch once, but the validator doesn't know that or care).

This is just semantics - in the actual game you could give Necturine Sketch as an egg move in Gen 5 (where it can only learn it once - egg moves are not inserted into the relearn pool until Gen 6). Then, remove Sketch from its learnset in Gen 6 so Necturine has to be transferred in knowing Sketch and only be able to use it once, because Sketch is still not part of its relearn pool. The same applies for Gen 7.

For Gen 8, Sketch doesn't exist and you can't get around that, so you just transfer in whatever Sketched move of choice from Gens 5-7 and are unable to obtain Gen 8 moves. In Gen 9 Sketch is back but you can't transfer Sketch in directly because the whole point is you don't want it to be able to relearn Sketch, so you play the USUM Burn Up Ho-Oh card. There is a stationary Necturine somewhere in the game that knows Sketch, but Sketch is still not part of its learnset or its relearn pool so if you delete it it's gone forever. Now you can learn whatever move exists in Gen 9, too. Repeat for every future generation Sketch is in.

Hopefully now that this is in a forum post I won't have to explain it all again!
 
Considering Necturna has been nerfed in its Speed stat in Gen 7, we might as well let it have access to Shell Smash and Sacred Fire, or whatever coverage move it would want. Both could still be allowed, but not both on the same set. Otherwise, I would agree with Marty's method of implementing Sketch only as a special event for a particular Necturna in Gen 9. Keep in mind Sacred Fire is only an example of a coverage move, and is not the only option instead of Shell Smash.
 
One of the most suggested options for an in-game explanation of Sketch in Necturine and Necturna is that there's an NPC that is able to teach them the Tutor Move Sketch only if Necturna and Necturine do not have a move that they cannot normally learn and can only be done once per Necturine/Necturna.

(Also what about testing Shell Smash + Sketch)
 
Alrighty, about time I updated where we are with this: After Marty's post earlier in the thread, the question surrounding Nect is answered... mechanically. The issues surrounding the re-implementation of Nect are now pretty firmly focused on if we want to re-open the can of worms that re-adding Sketch is, and if we do add Sketch back, what we should do regarding the earlier addition of Shell Smash as a replacement this gen. Should we re-add Sketch to Necturna's movepool? Should we keep Shell Smash in addition to the re-addition of Sketch?
 
Alrighty, about time I updated where we are with this: After Marty's post earlier in the thread, the question surrounding Nect is answered... mechanically. The issues surrounding the re-implementation of Nect are now pretty firmly focused on if we want to re-open the can of worms that re-adding Sketch is, and if we do add Sketch back, what we should do regarding the earlier addition of Shell Smash as a replacement this gen. Should we re-add Sketch to Necturna's movepool? Should we keep Shell Smash in addition to the re-addition of Sketch?
I'd say let's test Shell Smash + Sketch.
Even with Shell Smash she doesn't see a lot of usage, maybe it will be too OP or it will be enough for her to be good without being meta centralized, but we won't know until we try.
 
Alrighty, about time I updated where we are with this: After Marty's post earlier in the thread, the question surrounding Nect is answered... mechanically. The issues surrounding the re-implementation of Nect are now pretty firmly focused on if we want to re-open the can of worms that re-adding Sketch is, and if we do add Sketch back, what we should do regarding the earlier addition of Shell Smash as a replacement this gen. Should we re-add Sketch to Necturna's movepool? Should we keep Shell Smash in addition to the re-addition of Sketch?
I am of the mindset that yes we should re-add Sketch back into Necturna's movepool 100% as this is an integral part of not just Necturna, but the process it had originally. If what Marty stated is the way to "fix" this problem, then I think having access to one Sketched move alongside Shell Smash could prove too much and therefore overtune Necturna (and I am of the mindset that it will), but as Sami said there is no harm in trying as Necturna sees little to no usage as is, so if it is too much we can remove Shell Smash in the future as a nerf like we do in PPLs for current CAPs (or how we handled Draining Kiss for Chuggalong).
 
There is no reason Necturna should retain Shell Smash in the wake of regaining access to its one-time Sketch. If Necturna needs a buff, there is a buff process it can go through. Fixing its movepool because of a generational update should not be short cutting the buff process.
 
Yeah I think it’s pretty clear that Necturna ends up hilariously broken if it keeps Shell Smash. Those sorts of reckless balance decisions end up destabilizing ongoing tournaments, creating more work for the council members and programmers who have to carry out the inevitable nerf, and harming CAP’s reputation, legitimacy, enjoyability, etc — there’s just no world where it’s worth it. Necturna was given Shell Smash in the first place as an explicit compensation for not having Sketch at the time, since that was the Sketch move it most commonly ran. Sketch returns, Shell Smash leaves, simple as.
 
Necturna (F) @ White Herb
Ability: Forewarn
Tera Type: Pick your favourite
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Shell Smash
- Power Whip
- Shadow Claw
- Close Combat/Bitter Blade/Glacial Lance/Headlong Rush/Diamond Storm/Whatever you want tbh

Necturna (F) @ White Herb
Ability: Forewarn
Tera Type: Ghost probably
EVs: 252 Atk / 4 SpD / 252 Spe
- Shell Smash
- Poltergeist
- Power Whip
- Stone Edge (could go funky with tera and blast too)

Necturna (F) @ White Herb
Ability: Forewarn
Tera Type: Dealers choice
Evs: Who knows!
- Shell Smash
- Rage Fist
- Who knows, set would defo work tho
- honestly you could drop smash on this specific one and focus on rage fist to make this mon even more unhealthy

Necturna (F) @ White Herb
Ability: Forewarn
Tera Type: Have the people advocating for sketch + smash forgotten that this mon can change its typing now
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Shell Smash
- Shadow Ball
- Energy Ball
- Stored Power/Armour Cannon/Electro Drift/Whatever you want same as the first one but special

Necturna @ Wide Lens
Ability: Forewarn
Tera Type: Normal
EVs: 252 Atk / 4 SpD/ 252 Spe
Adamant Nature
- Shell Smash
- Population Bomb
- Shadow Claw
- Power Whip

Fun, huh? These all took me about 5 minutes collectively to come up with, there's almost certainly more busted combos. Kinda inevitable when you have smash + any move + the ability to change typing. Tera stellar in particular seems nutso to let you get a stank stab move off while still having potentially any coverage move in the back that doesn't get revealed by tera. Could run different items like life orb or whatever too, I just did White Herb cos I'm lazy.

Anyway TL:DR don't free this shit lol
 
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I think this thread has mostly run its course. We have a way to re-implement Nect's concept through marty's suggestion, which seems like a very clean way to resolve the issues we were having.

Looking at some of the calcs above, as well as the potential for e.g Smash + Espeed sets, I feel that Smash + Sketch is pretty clearly overpowered, and not really worth trying out, as it only creates extra work for folks.

Tagging Marty to implement his suggestion (aka readd single-use sketch, remove shell smash)
 
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