Announcements
7/23/18
Previous updates
Uncommon's FBI HM system patch
Hi everyone! This is my first public contribution to the world of ROM hacking. What I've got for you today is a patch for FireRed (English 1.0 BPRE) that changes the behavior of HMs in the overworld. This is heavily based on FBI's research on HM checks. All the credit for that research goes to FBI (along with knizz and touched), and I'll be referring to his thread throughout this post.
What is this?
What this patch does is change all the HM overworld use checks. Instead of needing certain badges and moves to use HM moves in the overworld, you need to have certain types in your party. The needed type is easily changeable, but the types I've chosen to start with are:
As described in FBI's post, the original inspiration was to match the show, in which Trainers can effectively Surf with any Water-type Pokemon, Fly with (almost) any Flying-type, etc. This also eliminates the need to carry around an HM slave, or overwrite good moves for useless ones like Flash.
How does it work?
I've hijacked the internal script for each HM and redirected it to a new script that checks the new condition - whether or not you have a Pokemon of the appropriate type in your party - and, if so, activates the HM's overworld effect. This check is accomplished with FBI's modified version of special 0x12b, also explained in his post. I've tested all the scripts thoroughly and I'm confident their text and sequence of events match their vanilla FR counterparts (if applicable). If you want to get a deeper understanding of how this works, read FBI's thread on changing the HM checks, and check out the script posted in the Advanced Usage section.
Usage
After patching, all of these are passive and don't require any editing to start using them right away, except for Flash. To apply the Flash hack, you need to add it as a level script to each Flash-able map in A-Map. Its offset is 0x760024. I recommend following diego's level script tutorial (starting at step 5, because the script is already done). For the flag variable in A-Map, use 4000. As FBI explained to me, this is a temporary variable that's reset whenever the map reloads, meaning it'll be ready to activate again each time you enter the map.
In the game
With the exception of now needing a type instead of a move and a badge, Surf, Waterfall, Cut, Rock Smash, and Strength work exactly how they normally do - press A to interact with an obstacle and follow the prompts.
If you have a Pokemon of the correct type (Fire by default), Flash will activate as soon as you enter a map with the level script applied.
To activate Fly, a new option has been added to the START menu: MAP. It shows you the town map, and if you have a Flying-type, lets you choose a location to Fly to. The MAP option shows up when you activate the POKEMON menu option (ie, when you get your first Pokemon).
Advanced Usage (optional)
Compatibility
Now, you'll notice I have used free space for these new scripts (from 760000-760704), which means this patch MIGHT NOT be compatible with hacks in progress. Since most people start at 800000, there's a good chance it IS compatible (for instance, this patch is 100% compatible with MrDollsteak's Attack and Decap Rombase!) but it's not guaranteed. If you really want to add this to a hack in progress, below are instructions for doing so.
Bugs
Credits
I intend to use this in my upcoming hack, and now you can, too! With permission from FBI, this patch is for public use. Feel free to use it as long as you credit the following people:
FBI - for the research and ASM development, plus help with fixing a bug with Fly
knizz - for helping in FBI's research on Fly
touched - for helping create FBI's modified special 0x12b
mbcn10ww - for discovering and fixing a bug with the wrong Pokemon being displayed
Uncommon - for writing the scripts, testing, and creating this patch
Downloads
and finally... the patch!
Version 1.1 - .zip file that includes both the full patch and a patch to upgrade from version 1.0 to 1.1, plus instructions in the ReadMe
Changelog
7/23/18
- Bugs section added to OP (there's only 1 tiny one, I promise!)
Previous updates
Spoiler:
Uncommon's FBI HM system patch
Hi everyone! This is my first public contribution to the world of ROM hacking. What I've got for you today is a patch for FireRed (English 1.0 BPRE) that changes the behavior of HMs in the overworld. This is heavily based on FBI's research on HM checks. All the credit for that research goes to FBI (along with knizz and touched), and I'll be referring to his thread throughout this post.
What is this?
What this patch does is change all the HM overworld use checks. Instead of needing certain badges and moves to use HM moves in the overworld, you need to have certain types in your party. The needed type is easily changeable, but the types I've chosen to start with are:
Code:
Surf - Water
Waterfall - Water
Cut - Grass
Rock Smash - Fighting
Strength - Fighting
Flash - Fire
Fly - FlyingAs described in FBI's post, the original inspiration was to match the show, in which Trainers can effectively Surf with any Water-type Pokemon, Fly with (almost) any Flying-type, etc. This also eliminates the need to carry around an HM slave, or overwrite good moves for useless ones like Flash.
How does it work?
I've hijacked the internal script for each HM and redirected it to a new script that checks the new condition - whether or not you have a Pokemon of the appropriate type in your party - and, if so, activates the HM's overworld effect. This check is accomplished with FBI's modified version of special 0x12b, also explained in his post. I've tested all the scripts thoroughly and I'm confident their text and sequence of events match their vanilla FR counterparts (if applicable). If you want to get a deeper understanding of how this works, read FBI's thread on changing the HM checks, and check out the script posted in the Advanced Usage section.
Usage
After patching, all of these are passive and don't require any editing to start using them right away, except for Flash. To apply the Flash hack, you need to add it as a level script to each Flash-able map in A-Map. Its offset is 0x760024. I recommend following diego's level script tutorial (starting at step 5, because the script is already done). For the flag variable in A-Map, use 4000. As FBI explained to me, this is a temporary variable that's reset whenever the map reloads, meaning it'll be ready to activate again each time you enter the map.
In the game
With the exception of now needing a type instead of a move and a badge, Surf, Waterfall, Cut, Rock Smash, and Strength work exactly how they normally do - press A to interact with an obstacle and follow the prompts.
If you have a Pokemon of the correct type (Fire by default), Flash will activate as soon as you enter a map with the level script applied.
To activate Fly, a new option has been added to the START menu: MAP. It shows you the town map, and if you have a Flying-type, lets you choose a location to Fly to. The MAP option shows up when you activate the POKEMON menu option (ie, when you get your first Pokemon).
Advanced Usage (optional)
Spoiler:
Compatibility
Now, you'll notice I have used free space for these new scripts (from 760000-760704), which means this patch MIGHT NOT be compatible with hacks in progress. Since most people start at 800000, there's a good chance it IS compatible (for instance, this patch is 100% compatible with MrDollsteak's Attack and Decap Rombase!) but it's not guaranteed. If you really want to add this to a hack in progress, below are instructions for doing so.
Spoiler:
Bugs
Spoiler:
Credits
I intend to use this in my upcoming hack, and now you can, too! With permission from FBI, this patch is for public use. Feel free to use it as long as you credit the following people:
FBI - for the research and ASM development, plus help with fixing a bug with Fly
knizz - for helping in FBI's research on Fly
touched - for helping create FBI's modified special 0x12b
mbcn10ww - for discovering and fixing a bug with the wrong Pokemon being displayed
Uncommon - for writing the scripts, testing, and creating this patch
Downloads
and finally... the patch!
Version 1.1 - .zip file that includes both the full patch and a patch to upgrade from version 1.0 to 1.1, plus instructions in the ReadMe
Changelog
Spoiler:
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