Take note that editing the breeding data for the game, while still relatively easy, can be a bit tedious and mind numbing because of the way the data is split up. You have been warned.

Important locationsEdit

0x3a208 Species + Species: Mate pointers
0x3a508 Species + Species: Lists of mates
0x3ae14 Species + Species: Results pointers
0x3b114 Species + Species: Lists of results
0x3b34e Species + Family: Mate pointers
0x3b64e Species + Family: Lists of mates
0x3b74f Species + Family: Results pointers
0x3ba4f Species + Family: Lists of results
0x3bb83 Family + Species: Mate pointers
0x3bb99 Family + Species: Lists of mates
0x3bdbf Family + Species: Results pointers
0x3bdd5 Family + Species: Lists of results
0x3be99 Family + Family

Basic usageEdit

DWM2_DD gave an amazing explanation of this structure over at GameFaqs so I'll be borrowing heavily from that. First note that all pointers are 2 byte, little endian, and work off of address 0x34000. All of these tables are in order by species ID or, in the case of Family + (something), family ID.

Let's start by studying the breedings for Slime, which has a species ID of 0xa. First we get the pointer for its mates. So multiply Slime's ID by 2 (because of the 2 byte pointers) and add it to the address for the mates pointers.

3a208 + (a*2) = 3a212

The pointer at 3a212 is [18 65]. Reverse the bytes and add 0x34000.

34000 + 6518 = 3a518

This is the address for Slime's mate data. There are some important things to note. [FD FD] is a set delimiter, showing that a list of possible mates for a specific result has ended. [FB FB] is another set delimiter that also indicates EVERY set after it will only work over a link cable. [FF FF] is the end of the monster's mate lists. Last but not least, we have [04 FE 04 FC] which tells you that there is a +5 breed for the monster. The rest of the values there are just species ID values for Slime's possible mates. With that in mind, it decodes like this:

04 FE 04 FC +5 Breed
FD FD End of set
4A 00 Mate: Pillowrat
53 00 Mate: Mommonja
FD FD End of set
0D 01 Mate: CopyCat
FB FB End of set; following sets require link cable
75 00 Mate: BigRoost
FF FF End of lists

If Slime+5 and Slime+5 breed they will produce result a. If Slime and Pillowrat OR Mommonja breed they will produce result b. If Slime and CopyCat breed they will produce result c. And if Slime breeds with BigRoost over a link cable, result d will be the result.

Now let's get those results. Start with the same basic process as before, but using the result pointer table instead of the mate pointer table.

3ae14 + (a*2) = 3ae28 (pointer is [1C 71])

711C + 34000 = 3B11C

Here you'll be thrown into the midst of a list of monster IDs. Only read to the number of results you would get from the mate data (in this case, that would be four ID values).

ID value Result Corresponds to?
10 00 KingSlime Slime(+5) + Slime(+5)
14 00 TropicGel Slime + Pillowrat OR Mommonja
16 00 HaloSlime Slime + CopyCat
1A 00 WonderEgg Slime + BigRoost; link cable only

Species + Family and Family + Species can generally be edited the same way. Do take note that family IDs are not inherently 2 bytes long though.

Family + Family breeding data is a bit different. It starts with a list of pointers that increment by 0x16, then has the actual data which is basically a table of results. The actual data starts with:

FFFF 0100 0200...

FFFF returns base monster (Slime + Slime) and then you would have Slime + Dragon and so on, following the natural order of the family ID values.

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