You won't be able to go to Mirage Island either.
just play on an emulatorYeah, I suggest this. Emerald on an emulator lets you get all 386 Pokemon through Gen 3 and some versions are considerably tougher. Also no worries about a clock battery.
It's not crucial to the game or anything, without the clock your berries won't grow (so planting them is a waste) and a few other daily events (lottery, berry hand-outs) will only happen once. Actually speaking of Feebas I think this makes it kind of hard to evolve. You won't be able to go to Mirage Island either. Still almost everything in the game works, I've replayed Gen 3 a couple times without the battery and it didn't change the experience very much.Weird my copy of Emerald won't even keep the save now that the battery inormal. It erases everything when it turns off.
A lot of GBA games use flash memory rather than a battery based save, so those should be good for a while. That's why your save file doesn't get erased when the battery dies in RSE. The battery only saves the clock; everything else is flash memory.
FWIW I've run Pokemon games on my phone before so they're still portable, but can't elaborate any further.Can we really still not talk about emulation on here?