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Hi. I'm Kyoufu Kawa. I'm an experienced rom hacker and learning GBA homebrewer. For one of my projects, I have to know with 100% certainty what the structures are on the Advanced gen. Pokémon games so you'll see me editing those pages every once in a while when disassembly progress reveals new data.
So I recently found out how the game handles the encrypted data. It doesn't. When the substructures are needed, they're decrypted, read/written and re-crypted. All because I saw something flash by in the memory viewer that looked like raw data.
And here's another fun thing to try: if you want to manipulate your opponent's Pokémon, including a wild encounter, try browsing to your party data (see Pokémon data structure in the GBA) and scroll up about 600 bytes. You see correctly.
My site
My challenge