Research: Darthatron's Hacks

[Darthatron]

Here are some hacks that I have made for people. I hope you enjoy them. I have attempted to explain how they work as well, for those who want to learn.

Remove the "Previously on your quest..." scene from game load.

Spoiler:

Hack:

Change bytes at 110F44 to 00 20
Change bytes at 110F50 to C0 46

Explained:

Spoiler:

Original:

08110F32 loc_08110F32:                           @ CODE XREF: sub_08110F14+3Cj
08110F32                 MOVS    R0, R2
08110F34                 MULS    R0, R7
08110F36                 ADDS    R0, R5, R0
08110F38                 ADDS    R0, R0, R6
08110F3A                 LDRB    R0, [R0]
08110F3C                 LDR     R3, =unk_0203ADF9
08110F3E                 CMP     R0, #0
08110F40                 BEQ     loc_08110F48
08110F42                 LDRB    R0, [R1]
08110F44                 ADDS    R0, #1
08110F46                 STRB    R0, [R1]
08110F48
08110F48 loc_08110F48:                           @ CODE XREF: sub_08110F14+2Cj
08110F48                 ADDS    R0, R2, #1
08110F4A                 LSLS    R0, R0, #0x18
08110F4C                 LSRS    R2, R0, #0x18
08110F4E                 CMP     R2, #3
08110F50                 BLS     loc_08110F32

Basically, this code counts the amount of important events that have occured. Once it reaches 3 (CMP R2, #3), it stops counting and continues the game as normal. What we want to do is make it so it always returns zero. We do this by setting R0 to 0 instead of incrementing as normal, and then removing the loop with the NOP (which literally does nothing) command.

New:

08110F32 loc_08110F32:                           @ CODE XREF: sub_08110F14+3Cj
08110F32                 MOVS    R0, R2
08110F34                 MULS    R0, R7
08110F36                 ADDS    R0, R5, R0
08110F38                 ADDS    R0, R0, R6
08110F3A                 LDRB    R0, [R0]
08110F3C                 LDR     R3, =unk_0203ADF9
08110F3E                 CMP     R0, #0
08110F40                 BEQ     loc_08110F48
08110F42                 LDRB    R0, [R1]
08110F44                 MOV     R0, #0
08110F46                 STRB    R0, [R1]
08110F48
08110F48 loc_08110F48:                           @ CODE XREF: sub_08110F14+2Cj
08110F48                 ADDS    R0, R2, #1
08110F4A                 LSLS    R0, R0, #0x18
08110F4C                 LSRS    R2, R0, #0x18
08110F4E                 CMP     R2, #3
08110F50                 NOP

Run a script from an items "Use" command or from registering it from select...

Spoiler:

First of all, follow DavidJCobb's Item Creation Tutorial, until the part where it attempts to add scripts, to actually create a new item. But change the "Type" combobox to #2 in the Item Manager. JPANs engine is not required!

Next step is to put this (assmelbed) code somewhere:

10 B5 04 1C 78 46 13 30 0C 49 08 60 20 1C 0C 49 00 F0 10 F8 10 BC 01 BC 00 47 10 B5 04 1C 0A 48 05 49 00 F0 07 F8 20 1C 06 49 00 F0 03 F8 10 BC 01 BC 00 47 08 47 C0 46 E5 9A 06 08 98 99 03 02 3D 10 0A 08 09 75 07 08 XX XX XX 08

Where XXXXXX is the location of your script reversed. 800300 would be 00 03 80, for example.

By entering this hex somewhere in the ROM and putting it's offset+1 in the "Field Usage" box in the Item Manager, you can call any script by using the item from the bag or by select. Say I put the routine at 800000 in the ROM, the Field Usage box would be 08800001.
Here's the unassembled code:

Spoiler:

.text
.align 2
.thumb
.thumb_func
.global Hax
	
setup:
	push {r4, lr}
	mov r4, r0
	mov r0, pc
	add r0, #0x13
	ldr r1, .unk_02039998
	str r0, [r1]
	mov r0, r4
	ldr r1, .sub_080A103C
	bl bx_r1
	pop {r4}
	pop {r0}
	bx r0

main:
	push {r4, lr}
	mov r4, r0
	ldr r0, .ScriptToCall
	ldr r1, .CallScript
	bl bx_r1
	mov r0, r4
	ldr r1, .del_c3_from_linked_list
	bl bx_r1
	pop {r4}
	pop {r0}
	bx r0

.align 2
bx_r1:
	bx r1

.align 2
.CallScript:
	.word 0x08069AE4+1
.unk_02039998:
	.word 0x02039998
.sub_080A103C:
	.word 0x080A103C+1
.del_c3_from_linked_list:
	.word 0x08077508+1
.ScriptToCall:
	.word 0x08800300

More to come as I can be bothered.

EDIT: Also feel free to ask about/request stuff here. I may not do all requests, but I'll try my best.

[Team Fail]

So, if I read this correctly, you can also make it record more than 3 important events as well depending on those 2 values?

[Darthatron]

Originally Posted by Team Fail

So, if I read this correctly, you can also make it record more than 3 important events as well depending on those 2 values?

Not sure. Even so, not with just this code. There's more code somewhere that reads it somewhere else. But I imagine increasing it without repointing something would be bad.

[Link_971]

Originally Posted by Darthatron

Spoiler:

Change bytes at 110F44 to 00 20
Change bytes at 110F50 to C0 46

EDIT: Also feel free to ask about/request stuff here. I may not do all requests, but I'll try my best.

I have found a little bug, if you save in a Pokemon Center.
When you restart, the game doesn't show the name of the Map.

[Fireworks]

Just wondering if you'd know anything about the hidebox command? In Ruby. when you use it in conjunction with showpokepic, it hides the box, showing only the sprite. This is useful for things like mugshots.
In FireRed though...it doesn't work :\

[jhay21]

Originally Posted by Darthatron

EDIT: Also feel free to ask about/request stuff here. I may not do all requests, but I'll try my best.

how about a pokemon type reader/checker i haven't seen one so maybe nobody's done it yet? you set a query to a variable like 01=fire 02=grass etc.
then it checks whether the type of the pokemon selected by special 0x9F has the same type returns 1 if yes, 0 for no

[ChaosBringer41]

I don't know if I'm asking in the right section (I got a headache trying to read the rules/FAQ). Anyway:

1) Can you - or anyone else - tell me how to upgrade the Pokedex in Pokemon Ruby, so that any non-Hoenn Pokemon are properly registered in the Pokedex pre-Elite Four?

2) On one of my 'this is how I'd like Pokemon Ruby to be like' hacks, I used a patch to put an old man in the intro instead of Professor Birch. The patch's name was Mr Fuji. According to my scribbled notes, I got it from PokeCommunity, but nothing on who made it. Any ideas? (I tried searching, but couldn't find it)

[Jambo51]

Originally Posted by ChaosBringer41

I don't know if I'm asking in the right section (I got a headache trying to read the rules/FAQ). Anyway:

This belongs in the general ROM hacking discussion thread, as opposed to here.

Originally Posted by ChaosBringer41

1) Can you - or anyone else - tell me how to upgrade the Pokedex in Pokemon Ruby, so that any non-Hoenn Pokemon are properly registered in the Pokedex pre-Elite Four?

They are correctly registered, you just can't see them because they're not part of the Hoenn Dex. The easiest thing to do is to extend Ruby's Hoenn dex to include all the other Pokémon. I don't know precisely how to do that off the top of my head.

Originally Posted by ChaosBringer41

2) On one of my 'this is how I'd like Pokemon Ruby to be like' hacks, I used a patch to put an old man in the intro instead of Professor Birch. The patch's name was Mr Fuji. According to my scribbled notes, I got it from PokeCommunity, but nothing on who made it. Any ideas? (I tried searching, but couldn't find it)

I highly doubt anyone will be able to help you.

And, so this post is actually on subject, these 2 hacks will probably have been of great use to many people. I hope you have more cool stuff up your sleeve, Darthatron!

[.parado✗]

Thank you!
The Item Stuff could be very useful for my Ruby hack.
I ever wonder how long you must research for those things..

[karatekid552]

Originally Posted by .parado✗

Thank you!
The Item Stuff could be very useful for my Ruby hack.
I ever wonder how long you must research for those things..

With the help of Darthatron, I have successfully ported over the item script runner to Ruby. Everything is the same, except the offsets:

.text
.align 2
.thumb
.thumb_func
.global Hax

	setup:
		push {r4, lr}
		mov r4, r0
		mov r0, pc
		add r0, #0x13
		ldr r1, .unk_03005D00
		str r0, [r1]
		mov r0, r4
		ldr r1, .sub_080C9050
		bl bx_r1
		pop {r4}
		pop {r0}
		bx r0

	main:
		push {r4, lr}
		mov r4, r0
		ldr r0, .ScriptToCall
		ldr r1, .CallScript
		bl bx_r1
		mov r0, r4
		ldr r1, .del_c3_from_linked_list
		bl bx_r1
		pop {r4}
		pop {r0}
		bx r0
.align 2
bx_r1:
	bx r1

.align 2
.CallScript:
	.word 0x080655B8+1
.unk_03005D00:
	.word 0x03005D00
.sub_080C9050:
	.word 0x080C9050+1
.del_c3_from_linked_list:
	.word 0x0807AB74+1
.ScriptToCall:
	.word 0x08XXXXXX

Here is the compiled version:

10 B5 04 1C 78 46 13 30 0C 49 08 60 20 1C 0C 49 00 F0 10 F8 10 BC 01 BC 00 47 10 B5 04 1C 0A 48 05 49 00 F0 07 F8 20 1C 06 49 00 F0 03 F8 10 BC 01 BC 00 47 08 47 C0 46 B9 55 06 08 00 5D 00 03 51 90 0C 08 75 AB 07 08 XX XX XX 08

Hope this helps all of the Ruby hackers out there!