Fast forward is the feature that speeds up the game. To access it, press the Tab key. Hold it down and let go until you want the fast forwarding to end.

Can you speed up MGBA emulator?

Recently got mgba to work and have been playing Pokemon Emerald. Other emulators like visual boy advance have a speedup option to make the game go faster. This helps with grinding Pokemon.

How do I change the speed button on MGBA?

You just need to hold function key (Fn) and press it that the speed up works. Thanks again schumi and boomdart.