>>46580863> the only thing I recall them probably not having are internal clocks with batteriesFRLG don't have internal clocks. Emerald has an inherently broken RNG and therefore the only problem you'll face with a dead battery is non-respawning berries and being locked into one time of day for day/night evos (which I think at that point was exclusively Espeon and Umbreon). Even if you buy a cartridge with a dead battery they are brain dead easy to replace. Get a <$20 soldering iron from Amazon and a 20 pack of cart batteries for $5 from eBay. I know gen 1/2 carts need a gamebit screwdriver to open them up but I don't recall with gen 3. But those are cheap too.
OP, well-made repro carts should be able to transfer. Just make sure you're getting a good repro and not some cheap Chinese shit.