[Battle] add DARK type in YELLOW.gbc (help)

[Monaco]

Hello all

So I've been tempering with customizing a yellow rom to fit some improvementes. For example I changed the hex to make GHOST now super effective against PSYCHIC (which, due to a code error was 0x damage).

I also wanted to make a dark type, now in the RBY code there is a BIRD type (although the only BIRD type pokémon is missingno) and I thought I could change the name bird into DARK and make it into the type effectiveness table.

I used a tool called Poke Edit GB to change a Zubat second type into N/A (Between Rock and Bug), and confirmed that the zubat inside the game display as POISON / BIRD
https://prnt.sc/10wpxb0
And I used AttackeditorGB to change BITE from NORMAL to N/A 06 (BIRD) type and made the type super effective against PSYCHIC on the hex editor.
https://prnt.sc/10wpxly

Can someone give me some light on how to change the name BIRD into DARK?

I looked it up with PokéText but I can't find the bank where the types names are.

 

[Monaco]

ps: I know there is no DARK Pokémon in Kanto, but dark moves would be an improvement to the ROM