the best i could think of is to run wireshark in promiscuous mode on a laptop and capture all the packets.
this only work ds->router and not ds->ds since that uses a specialized protocol (as far as i can remember)
to receive all packets the wifi card on your computer needs to support monitor mode. if it doesn't then you will not catch most of the ds packets - at least for ds to ds traffic where it is not connected to an AP
iirc direct ds to ds communications have very tight timing requirements. I have no idea what you mean by "I am using wifi" so it should work. The wifi card in your computer needs to be able to enter monitor mode and send/receive non-standard wifi packets - manually set wifi packets sequence numbers etc. not all wifi cards allow you to do this. you should take a look at the source code for desmume.
I doubt that "I'm using wifi" will be enough to man-in-the-middle attack the ds wifi communications
I guess the easiest way would be providing the Internet to the DS from your Laptop or a PC with wifi and then sniff it out with wireshark but this will only work if the wifi provided by the computer is running in infrastructure mode (the mode that routers and wifi access points run in), ad-hoc mode won't work.
Edit:
If you actually really want to take a look at the wlan from a bystander position(as in not being already a user inside the wlan or even the machine providing the wlan to the DS) you should take a look at real wlan sniffing, for Linux check kismet out (passive scanner that requires your wlan adapter to be able to run in raw monitoring mode) and for windows maybe netstumbler (active scanner).
I'm really no expert on this, google is your friend.
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Do I restart now using what i've learned on the EU version since it's a better overall experience? or do I continue with the US version since that is what ive been using, and if someone decides to play my hack, it would most likely be that version?
@TwoSpikedHands, I'll preface this with the fact that I know nothing about the game, but, I think it depends on what your goals are. Are you trying to make a definitive version of the game? You may want to refocus your efforts on the EU version then. Or, are you trying to make a better US version? In which case, the only way to make a better US version is to keep on plugging away at that one
I'm not familiar with the technicalities of the differences between the two versions, but I'm wondering if at least some of those differences are things that you could port over to the US version in your patch without having to include copyrighted assets from the EU version
@Sicklyboy I am wanting to fully change the game and bend it to my will lol. I would like to eventually have the ability to add more characters, enemies, even have a completely different story if i wanted. I already have the ability to change the tilemaps in the US version, so I can basically make my own map and warp to it in game - so I'm pretty far into it!
I really would like to make a hack that I would enjoy playing, and maybe other people would too. swapping to the EU version would also mean my US friends could not legally play it
I am definitely considering porting over some of the EU features without using the actual ROM itself, tbh that would probably be the best way to go about it... but i'm sad that the voice acting is so.... not good on the US version. May not be a way around that though
do y'all think having an sd card that has a write speed of 700kb/s is a bad idea?
trying to restore emunand rn but it's taking ages... (also when I finished the first time hekate decided to delete all my fucking files )
@The Real Jdbye it hasn't given me any error trying to write things on it so I don't really think it's faulty (pasted 40/50gb+ folders and no write errors)