[Solved] Permanent Crowned/Eternamax + Battle Tower clause removals (+/- any additional QOL improvements)

[isleep2late]

If you want the quick way to do this, here is a link to the Sword/Shield part of the Un-Nerf Compendium containing the patch and how to apply it :)

Hey all! Once again, we have made some breakthroughs into ROM research, including removing Battle Tower restrictions and giving permanence / persistence to the Crowned Zacian / Crowned Zamazenta / Eternatus Eternamax formes!

Ethical Disclaimer: Research was AI-assisted, but verified by me.

Two small `.pchtxt` code mods for Pokémon Sword & Shield, for personal/offline use on emulator (built and confirmed on Eden v0.2.0, game v1.3.1). Both are tiny IPSwitch text patches - no ROM redistribution, you supply your own dump. Sword and Shield offsets included.

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1) FormePersist - Crowned Zacian / Crowned Zamazenta / Eternamax Eternatus stay set

Set the forme in PKHeX and it now persists through save + reload with no held item, and shows correctly on the team menu. SwSh treats these as battle-only formes and resets them to base on load; this forces the game's `IsBattleOnlyForme()` detector to return 0 so the reset paths never fire. It's the Gen-8 analogue of the Gen-6/7 Mega/Primal persistence patches.

2) NoTowerClause - Battle Tower species + item clause removed

Lets you enter the Battle Tower with **two of the same Pokémon** and/or **two of the same held item**. SwSh's Tower has no banned-species list - the species clause and item clause are the entire restriction - so this lifts it fully. All other entry checks are untouched.

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**Install (Eden/Yuzu):** drop the title-id folder into `…\eden\load\`, e.g.
`…\load\0100ABF008968000\NoTowerClause\exefs\noclause.pchtxt` (Sword) / `…\load\01008DB008C2C000\…` (Shield), then Properties -> Add-Ons -> tick it. (Make sure the GDB stub is off.)

Patch contents (v1.3.1):

FormePersist - `IsBattleOnlyForme` -> return 0:
```
Sword  @nsobid-4628A512…    Shield @nsobid-DBDDD138…
013AE910 00008052           013AE940 00008052
013AE914 C0035FD6           013AE944 C0035FD6
013AEC68 1F2003D5           013AEC98 1F2003D5
```
NoTowerClause - force the per-slot duplicate-species & duplicate-item flags to 0:
```
Sword                       Shield
014F9654 08008052           014F96C4 08008052
014F965C 19000014           014F96CC 19000014
014F96DC 09008052           014F974C 09008052
014F96E4 1B000014           014F9754 1B000014
```

Two Eden gotchas if you roll your own: `@enabled` is mandatory (without it Eden applies zero bytes), and use `@flag offset_shift 0x100`.

Offsets are for v1.3.1 (build IDs above); a different game update needs them re-derived. Single-player/offline use - don't take these into pvp battle without your opponent's permission.

(Bonus in the same folder: `DynamaxCandyAll`, a one-liner that lets you feed Dynamax Candy to the three legendaries. Actually letting them *Dynamax* is a RomFS personal-table flag - `CanNotDynamax` - i.e. the pkNX edit, not a code patch.)

Here's the article explaining the in-depth reverse-engineering behind removing Battle Tower restrictions.

And here's the deep dive into permanent formes for Gen 8.

-IS2L

 

*If there's any additional discoveries for Sword and Shield, I will just addend this thread so that I don't clog up the rest of the forums. Will make the title of this post reflect that.*