[Other] Changing which Pokemon roams in Emerald

[C me]

Latios/Latias start roaming after you beat the Elite Four and you choose which one when your mum asks you what colour the Pokemon on tv was.

That's this part in the script:

Spoiler:

multichoice 0x16 0x8 0x6C 0x1
copyvar 0x8004 LASTRESULT
special 0x12B
copyvar 0x40D5 LASTRESULT

Before and after that is text.

What do these actually do? How can you change them to make a different Pokemon roam.

Thanks

 

[Touched]

Latios/Latias start roaming after you beat the Elite Four and you choose which one when your mum asks you what colour the Pokemon on tv was.

That's this part in the script:

Spoiler:

multichoice 0x16 0x8 0x6C 0x1
copyvar 0x8004 LASTRESULT
special 0x12B
copyvar 0x40D5 LASTRESULT

Before and after that is text.

What do these actually do? How can you change them to make a different Pokemon roam.

Thanks

Special 0x12B is given the result in 0x8004 via the multichoice - 0 for Latias, 1 for Latios.
Thus you can manually change what is in var 0x8004 and then call the special to activate roaming for that Pokemon. The special generates the Pokemon's attributes, ensuring you always encounter the SAME Pokemon (not with different IVs or anything).

Changing the Pokemon you actually encounter is not a simple byte change, as the indices for the Pokemon are controller by a routine - only the index for Latias is easily changeable.

I did a quick ASM hack that you can try (untested)

Using a hex editor, change the bytes...
at 0x161BA0: 03 48 01 68 03 4A 89 18 04 4A 12 88
at 0x161BB8: E2 75 03 02

Then from a script

setvar 0x8005 INDEX_OF_ROAMING
special 0x12B

 

[Foxes]

Latios/Latias start roaming after you beat the Elite Four and you choose which one when your mum asks you what colour the Pokemon on tv was.

That's this part in the script:

Spoiler:

multichoice 0x16 0x8 0x6C 0x1
copyvar 0x8004 LASTRESULT
special 0x12B
copyvar 0x40D5 LASTRESULT

Before and after that is text.

What do these actually do? How can you change them to make a different Pokemon roam.

Thanks

Extremely late reply, but do you still happen to know how you accessed the script? I'm looking to remove the roaming Pokémon altogether, but I can't for the life of me figure out how to access the script. It's nowhere to be found when looking in AdvanceMap, at least where I've been looking.