Posted by Generic aka RSDuck

1. could it be possible that you have mixed up wifi and wireless communication? Wireless is only emulated for melonDS <-> melonDS because your computer can't send a signal which the DS can pickup. Wifi on the other hand works between emulator and a real game because it requires a server in the middle.
2. Not every WFC replacement server supports all functionality (Battling, personal trading, GTS, battle camera…). https://pkmnclassic.net/ is specialised in Pokemon I think they provide most of it.
3. Don't use direct mode anymore. With 0.9 or later indirect mode (direct mode being disabled) is the recommend setting because it doesn't require pcap or an ethernet connection.

Posted by Athanatos

Thanks so much for the advice! Didn't know indirect mode works now so I'll switch to that. Also I think you've just helped me realize a solution to my issue by clarifying how the DS Wireless Connection works - I'll just upload the save file of my White 2 game and run it on melonDS as well, since you said between itself melonDS should work. Will update.

Edit: So I'm trying to run both on melonDS and I'm still not able to see them connect. Not only do neither register themselves in C-Gear, but I can't Send & Receive Keys in Unova Link, which was my initial purpose. I tried Direct Mode, Indirect Mode, having Bind Socket on and off, and yet the two games still can't connect to one another via DS Wireless Connections. What can I do?

Edit 2: I'm making a little bit of headway after 4 hours! So I've effectively patched the problem with C-Gear: simply setting MAC Address to randomize completely fixes DS Wireless Connection compatibility! However, there is still the problem that Sending & Receiving Keys won't work - one thing I've noticed is that this feature loads both Infrared and DS Wireless Connections, so my understanding is that the issue is in fact with Infrared. I've done some Googling and from what I can find melonDS doesn't yet have Infrared support. Anything I can do about this? Thank you.

Posted by Generic aka RSDuck

Direct/Indirect mode only matters for wifi stuff not for local wireless. And yeah melonDS doesn't emulate IR.

Posted by hmm

which DNS server are you using

Posted by Khentendo

It would be cool if melonDS could set up a wireless hotspot for DS/3DS systems to connect to Nintendo WFC.

Posted by Winda

Hello i'm trying to do a trainer battle in pokemon Heartgold but the other player isn't showing up. I've followed the explanation to connect to the Nintendo WFC and i can get mystery gifts but I don't see the other person (who is using a different pc but same app just using SoulSilver). We are both able to go into the union room and both are able to select the battle arena w.e it's called. But neither of us see the other.

Posted by Wifall

It could be a NAT or UDP issue, the only way to solve that is either opening the required ports in the router OR using melonDS direct mode in wifi settings.