This link can be unstable and may not work 100% of the time due to timing inconsistencies between the two emulators. The performance of your PC could affect the success rate of the connection.
You'll need a GBA and GameCube game that can connect.
This guide applies to:
Colosseum Bonus Disc
Pokemon Colosseum
Pokemon Channel
JPN Colosseum Bonus Disc
JPN Pokemon Colosseum
Pokemon XD Gale of Darkness
Step 1: Set up VBA-M
Navigate to GBA options and select "use bios file".
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Press configure and choose the bios file to use.
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Choose GameCube link.
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Start the network link.
Step 2: Set up Dolphin
Set port 2 to GBA.
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Step 3: Establish the connection
When asked by the GameCube game to activate your GBA, import the battery file.
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If the connection fails to establish immediately, try to restart the game or retry importing the battery file. If a connection is established but an error occurs, keep on trying.
After few restarts, the connection should succeed.