Is there a particular reason to use the European offerings if you presumably speak English? Sometimes there can be notable differences beyond language (in mainline pokemon the gambling stations being notable in this) but a casual search did not reveal much.
Anyway porting cheats...
Assuming they are plain memory cheats (classical infinite potions, ammo type deal) then one of two things tends to happen
1) The location within the memory changes.
2) The data format changes. Not common for gameplay concepts but seen more in names (the changing from 16 bit in Japanese to 8 bit encodings outside it often also triggering a location change as well if the resulting data is stacked end to end, same problem also arises in save editing/why porting saves between regions is tricky).
Most of the time translation and localisation efforts have little need of changing things here so find something and the data you want will be if not the same distance away then near enough that you can spot it manually. Many however will opt to make it again if they are easy enough, and maybe take a hint on a solution if the obvious choice (more on that shortly) is in fact not the ideal solution.
If indeed the game's own code is changed (quite possible as the binary is loaded into memory to run and thus within range of cheat devices that have no chance of altering cart reads or something like the game genies of old) then you get to understand what was done. Memory location manipulation being very much a thing (indeed one of the big three things game code ever does) can make this more tricky, and sometimes clocks in games can need some more subtle attention -- hold a clock on infinite and certain events might not happen, if the game counts it down as a bonus score or something then holding it will see you unable to finish the mission...).
The location the binaries for a given game are copied to is easy to find with various ROM bothering tools (I usually liked ndsts for this) and overlays can be found in many similar manners. Not all of the binary is instructions (
https://tcrf.net/Pokémon_Ranger:_Guardian_Signs notes all sorts of wifi error codes which I tend to find in there) and overlays even less so, and that is before you encounter games that pack it all into overlays.
I am not going to be able to grab things and do it but to at least start
https://doc.kodewerx.org/hacking_nds.html should detail code types.
Three lines and I have some idea of what is coming but will take the long form
520465C8 C2444001
Code:
Type 0x05
Equal To
5XXXXXXX YYYYYYYY Checks if YYYYYYYY == (word at [XXXXXXX]).
If not, the code(s) following this one are not executed (ie. execution status is set to false) until a code type D0 or D2 is encountered, or until the end of the code list is reached.
020465C8 C2444000
Code:
Type 0x00
32-bit
0XXXXXXX YYYYYYYY Writes word YYYYYYYY to [XXXXXXX+offset].
D2000000 00000000
Code:
Type 0xD2
Loop Execute Variant/ Full Terminator
D2000000 00000000 Executes the next block of codes 'n' times (specified by the 0x0C codetype), and clears all temporary data. (i.e. execution status, offsets, code C settings, etc.)
This code can also be used as a full terminator, giving the same effects to any block of code.
So it checks to see if 020465C8 in memory (
https://problemkaputt.de/gbatek.htm#dsmemorymaps , well into the main normal memory, could be binary but I have not checked) has the value C2444001 present. If it does then it writes the same location with C2444000.
For a timer change and value that is a bizarre one. If it is not some piece of actual code then I would wonder if it is a flag that some other mission types (or easy mode) use and it is just tricking them, or maybe it is a multiplier (some pickup that says 10% more time on missions could be implemented as a multiplier and this then changes the rate/multiplier).
If you are lucky then start one of those timed missions and search a memory dump for C2444001. If it is a flag or a non memory instruction then it might well be the same and you can redo accordingly. Otherwise time to figure out what it does and alter that instead.
You might have to remake the obvious choice of code as well -- time, number of steps... whatever it tracks normally and see why the obvious choice of just holding that number solid did not do anything.
