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PL* files were used by the Pokemon Link feature. This feature existed in Gen 6 and was used by Pokemon Bank to distribute gifts to the games. These files can be injected by PKHeX, you can then receive the Pokemon in the start menu of the games. PCD (Pokemon Card) are wondercards from Gen 4, so basically WC files with a different name. While the games could only store up to 3 wondercards, the game could actually have up to 12 gifts waiting to be received from the delivery guy. That's why the PGT (Pokemon Gift) files exist. The PGT data is part of the PCD data. PGF (Pokemon Gift) files are wondercards from Gen 5, also basically WC files with a different name. Starting with Gen 6 it was decided to use WC* for wondercard files. There are WC4 files, which are mostly identical to PCD files. The only difference is that by default the Pokemon data inside the PCD is encrypted while in the WC4 it is decrypted. They are both compatible with PKHeX. You might also have seen some WC*Full files. These are the full data that was sent to the games by the distribution software, it includes the WC* data and some other data that's not relevant for most use cases, like the distribution text that's shown when the card is received.

I was able to edit type/category/power/accuracy/PP for moves but that's pretty much all. It looks like the data size is not fixed for each move and pretty hard to understand what each byte means. I.E. Sometimes the type comes right before the category and sometimes there is an extra byte between the type and the category. This probably means if we want to change the move additional effect we need to edit some pointer table too. I would like to know if there is any available and shareable results so that I (and other potential readers) don't need to research everything from the beginning.

@Dragazaif you can dump the games RAM while you’re battling the trainer you can use this application to extract the Pokémon.