pokegold VS r2dumpbin

If you still want the DVs, they should be 15, 13, 13, 14 for Attack, Defense, Speed, and Special Attack/Defense, respectively, which means the HP DV should be 14. You can find them here (Gold/Silver) and here (Crystal), though the only difference is that Crystal contains an additional entry for Eusine.

One other option is to actually look through the decompiled silver/gold roms, and find the code that actually generates the bytes - then you can copy this functionality on your Arduino.

The most common version of the myth is that in Gen 2, to save on space, each Pokémon was assigned a shiny palette based on its own colors. You can see the notes from a project to decompile Gold's code here: https://github.com/pret/pokegold/blob/1521f52e37741a9220a1362443df6d0462e582d3/data/pokemon/palettes.asm

~330k lines of assembly for gold/silver

Also again, you can compile Pokemon games without a ROM right now from GitHub. Here's Gold for instance: https://github.com/pret/pokegold

Follow the installation instructions

As for your wondering if you could change your name by loading the name entry screen, it might be possible but I don't know if anyone's looked into it (I personally found directly editing my name via boxcode to be easier and more predictable), or if there'd be some unintended consequences from calling that specific routine when you normally aren't supposed to. You'd have to look into how the name entry works (you can find a disassembly for Gold here which has the relevant functions in human-readable assembly), ensure it'll write your name to the correct memory addresses, find the routine's exact ROM address then write a boxcode to call that routine and then safely return to your game.