This is why WE should be voting
DNB on Custap Berry.
I will be using stats and meta knowledge to back my opinion and will leave a TLDR at the end.
Basically there's echoes framing Custap Berry as an unhealthy and uncompetitive item in the current SV metagame. Apparently, it creates a lot of 5050s and it can be ran on any Pokemon making the majority of games a plain 5050 or cornering the user in making misplays.
These statements are wrong in both casual and competitive level of play.
Starting with the higher sample size which is casual play, I delved into ladder statistics to see if there's any surprise user of Custap or if it's really affecting games. For reference here are the stats;
https://www.smogon.com/stats/2024-01/moveset/gen91v1-0.txt and
https://www.smogon.com/stats/2024-01/gen91v1-0.txt
By clicking on the first link and searching for the item Custap Berry and cross referencing with the second link the top Pokemon we get the following popular Custap Berry users; Archaludon (13%), Primarina (63%), Skeledirge (36%), Sylveon (34%), Urshifu (13%), Sturdy users. The other usage of custap berries on other mons are negligeable due to 1) Very Low percentage of that item on each mon, 2) Very low viability / usage of the Pokemon as a casual pokemon. Custap users on a casual level of play are predictable, and there's not a lot of variability that showcase that the item is used on a lot of Pokemon to predict a 5050 everytime,
other Pokemon would rather run any other more viable item for them which making it less of a surprise factor but more of a help for the aforementioned Pokemon. I will write about the top used Pokemon & Custap later on.
On a competitive level of play, I have fetched GC replays and implemented them into the fullifegames scouter; ref:
https://fulllifegames.com/Tools/ReplayScouter/#/ then I filtered the revealed Custap Berry. You can visualize the results below;
Apart from Dragalge and Munkidori, the Custap Berry users in GC obeyed to the general rule of them being predictable and part of the metagame knowledge, Munkidori ref;
https://replay.pokemonshowdown.com/gen91v1-2041004497 did not do anything with Custap, however Dragalge won a few games against opposing Dragon-type Pokemon with it. Custap Berry in GC was fairly limited to the Pokemon that were already mentioned so there's nothing out of the ordinary in that tournament.
Doing the same exercise in 1v1 Champs reveals only on usage of Custap Berry on Skeledirge. Not enough data but it follows that people are not using that item a lot. 1v1 Champs B league reveal the same thing, only Archaludon used Custap Berry as of today.
In both Casual and Competitive games, Custap Berry usage is only limited to a fair and predictable amount of Pokemon which is used to knowledge check and be a healthy part of the metagame. A lot of Pokemon would rather use other items; see Booster, WP, Choice Items, Amulet, to nail their MUs and be more consistent.
Now into the Pokemon and if their "different" sets can affect the outcome of the MU alongside outplaying Custap.

This pokemon typing is amazing and custap is a one of the reasons why it is so good alongside its typing and how many threats it can beat. It might mix stuff up with Specs or Resist Berry however it still has linear checks. Pokemon such as Metagross, Arch, Ogerpon, Bolt, Volcanion, Rillaboom, Meowsq, Serp, and Zapdos can consistently beat it while other Pokemon such as Greninja, Hoopa-U, Iron Crown, Ninetales-A, and Ursaluna have really good odds of beating every set with little to no outplaying. It still is a top Pokemon due to its MU spread but it has to do with it typing,and natural bulk that make it that good. Oh Yea and Encore.

Torch+BBurn+Encore is v good ye we get it. But it loses to a lot of Pokemon no matter it sets. It loses due to its typing including against dragon types (bolt, drago), waters (prim, wake, mana, volcanion), some grounds (ursaluna), hoopa-u, urshifu...

No encore so its easier to outplay. Mons that beat it include Steels (Metagross, Arch, iron crown), fires (Volcarona, Skele, Ogerpon-H), Ursaluna, Greninja...

Power Herb is its main set but Custap Berry has some usage. I think Archaludon "problems" go way deeper than Custap spc with Stamina press. Anw, Pokemon such as Hoopa-U, Tusk, Ursaluna, Leech Seeders like Ogerpon/Serp, Iron Crown, Lando-T.. have good odds to beat all its sets.

Not v relevant w/ custap but Fairies take it out easily and other naturally bulky Pokemon.
Sturdy: I won't go much into that cause they don't have encore and can be outplayed p easily.
You don't have to predict nor play any 5050 mindgames with the Custap Users since every one has a plethora of checks and counters no matter what they can normally run.
You don't have to predict custap and u don't have to play around custap in a most cases. These Pokemon are LINEAR. Custap Berry usage allow to both Build Check and Knowledge check the players and make you pick the counter and not midground everytime. It adds depth to the game. If one click a midground against Prim and Skele then complain about Custap it's mostly the fault of the player since they knew that these Pokemon would most of the case be running Custap Berry.
Additionally, the argument of Pokemon being in a chokehold with running Protect, prio etc is simply WRONG. Going down the VR, a lot of Pokemon would NATURALLY run these moves due to how they are played. These mons include; Gouging (Bulwrak), Metagross (Prio), Val (Protect), Ogerpon (Encore, Spiky), Nineales-A (Protect), Bolt (Prio), Haxorus (Unnerve), Shifu (prio), other Pokemon do not run tect for custap users, they just don't run it at all. Other bulky mons can fend off the usage of random custap that includes Cress, Corvik, Luna, Drago, and Registeel.
If you don't care about the outcome, you should def reconsider your opinion. The removal of custap for no reason will do more damage than actual good. There's
NO concrete evidence and results that showcase that this item is unhealthy. Banning something for little to no reason will damage the metagame as we'd lose the power of some great mons that balance the metagame such as Skele, Sylveon and Primarina which are really good glue Pokemon for no reason.
To RECAP;
- NO concrete evidence of Custap limiting the builder via stats, VR, and metagame trends.
- Custap users are LINEAR and Predictable with a consistent set of checks and counters no matter what they run
- Custap allow a fair knowledge check and create depth allowing the more skilled users to win in the builder and during the clicks.
- HEALTHY item in the game pushing for more limited diversity and keeping the metagame fresh and not too overbearing.
Consider voting DNB, #SAVECUSTAP