I don't think No$GBA ever supported linking to Dolphin at all, but a version of VBA-M did. However, work is being done on Higan (thanks to shuffle2 and jchadwick) that's already gotten further than VBA-M ever did. I don't know the status of transferring Pokemon, but it's showing more promise than anything else at the moment. See this thread: https://forums.dolphin-emu.org/Thread-new-prototype-gcn-gba-link-cable-emulation-demo
JMC47 probably has the latest details, so perhaps he'll fill you in on what's been happening in that regard.
JMC47 probably has the latest details, so perhaps he'll fill you in on what's been happening in that regard.