[ASM & Hex] Fixing light ball code to turn into thick club and stick

[loser]

So I just want to add Thick Club and Stick to my new alolan marowak and galarian farfetch'd (and sirfetch'd) in my firered hack, but it seems modifying the battle scripts would be really hard.

So I want to instead make a new stick and new thick club with this code https://www.pokecommunity.com/posts/8533356/ however I don't really know ASM, and I don't want to learn a ton of it just for this. I think modifying this script is probably the easiest way.

So I figured out that

cmp r0, #0x19

is where it checks if the pokemon is pikachu, so I'm asking here
1. How would I make it pikachu, raichu, OR pichu for example (even though I want cubone, marowak, and alolan marowak) instead of just pikachu
2. Which line is the special attack buff?
3. How would I make it a critical hit boost instead of an attack and special attack boost?
4. Is this code even safe?
5. Say I have the perfect ASM code for the items, how would I either modify thick club and stick or make a new item with this code?

Also I'm not using CFRU because I want gen 3 mechanics.

Thanks, if anyone can answer any of these