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PKHeX is a save editor for core-series Pokémon games. With it, users can manipulate various save files including: .sav, .dsv, .dat, .gci, .raw, and .bin types. PKHeX can also read and write: .pk files, which are individual Pokémon files, and .pgt, .pcd, .pgf, .wc, which are Mystery Gift files. Version 21.11.21 of PKHeX has been released, with feature and legality updates for BDSP. Change log: Download | FAQ | Support Forum View full article

Use the latest release.

Cosmetic edits that have no impact on gameplay is not something the developers are really interested in. It's not implemented, and usually depends on the community to figure out where that is before it is implemented in the program.

Why would you need that? It is recommended to always use the latest version, but you could compile it from the source https://github.com/kwsch/PKHeX/releases/tag/19.12.26

no but this reddit user does you can ask them