tutorial [Tutorial][HGSS] Edit the Incense-induced babies

[MeroMero]

I wasn't kidding when I said that I had a load of tutorials to write down.

• Decompress arm9.bin
  
• Go to offset 0×FF4AE*
  
• You should see this:
  

      68 01 FF 00 CA 00
     2A 01 FE 00 B7 00
     B7 01 3A 01 7A 00
     B6 01 3B 01 B9 00
     BE 01 3C 01 8F 00
     CA 01 3D 01 E2 00
     96 01 3E 01 3B 01
     B8 01 3F 01 71 00
     B1 01 40 01 66 01

Format is BB BB II II DD DD.

• BB BB is the baby produced when at least one parent holds the corresponding item.
  
• II II is the item that at least one parent has to hold.
  
• DD DD is the default baby when none of the parent holds the corresponding item.
  

For example we’re going to dissect the 7th row, shall we?

96 01 is a Pokémon ID.

Invert the 2 bytes and you get 01 96.

Converting from base 16 to base 10 we get 406.

Oh, it’s Budew!

This is the same principle with the item ID and the default baby ID.

Item ID: 3E 01 => 01 3E => 318 => Rose Incense

Default baby ID: 3B 01 => 01 3B => 315 => Roselia

The instruction is as follows: If at least one of the Parents hold the Rose Incense, Budew will hatch from the egg, otherwise Roselia hatch from the egg.

So if you have understood, it means we basically have to replace all 9 instances of DD DD by their corresponding BB BB.

By changing the aforementioned bytes you get this:

      68 01 FF 00 68 01
     2A 01 FE 00 2A 01
     B7 01 3A 01 B7 01
     B6 01 3B 01 B6 01
     BE 01 3C 01 BE 01
     CA 01 3D 01 CA 01
     96 01 3E 01 96 01
     B8 01 3F 01 B8 01
     B1 01 40 01 B1 01    

Neat, now how about you go and hatch that Budew without a Rose Incense, hum?

* Regions’ differences:

   Language          Offset

   Japanese          0×FFEC2
   English           0×FF4AE
   French            0×FF492
   German            0×FF462
   Italian           0×FF426
   Spanish HG        0×FF496
   Spanish SS        0×FF49E
   Korean HG         0×FFB5A
   Korean SS         0×FFB52