[Feature] A swarm editor for gen 4-5 should be easily doable as its an object in P…

[codemonkey85]

Reporter: Jon (dominican5554@aim.com)
App version: 2026.06.0702.3424
PKHeX.Core version: 26.5.5.0
User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Safari/605.1.15

Details

A swarm editor for gen 4-5 should be easily doable as its an object in PkHEX.core through the swarm seed (and the corresponding modulus operation that is attached to specific species)

[codemonkey85]

Thanks for the request! Confirmed this is a valid, net-new feature — there was no existing issue covering it.

A few notes for tracking:

• Gen 5 (BW/B2W2): PKHeX.Core exposes the swarm data directly in Encount5 — SwarmSeed, SwarmMaxCountModulo, and the computed SwarmIndex => SwarmSeed % SwarmMaxCountModulo. This matches the "seed + per-species modulus" you described exactly.
• Gen 4 (DPPt/HGSS): the daily-swarm data lives in the Gen 4 Encount4 save substructure.
• One caveat: PKHeX's own WinForms app does not ship a dedicated swarm-editor UI for Gen 4/5, so there's no existing UI to mirror — this would be net-new design on our side (the underlying Core data is there, though).

I've folded this into the per-generation feature trackers so it isn't lost:

• Gen 4 (Diamond/Pearl/Platinum, HGSS) Features #339 — Gen 4 (DPPt, HGSS) Features
• Gen 5 (Black/White, B2W2) Features #338 — Gen 5 (BW, B2W2) Features

Keeping this issue open as the originating request.