Why can't I grow berries in Emerald even after replacing the battery?

Question

Hi,

So I changed out my battery in my Pokemon Emerald because it died and now all the time based events work except berry growth. Shoal cave, match call, and my clock all function normally and I can't find anything about it. Please help.

Comments

So I replaced it a few months ago and after I did, I started a new game. Would playing it on a DS lite cause this issue at all?

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I can find no documentation to suggest that DS Lite would affect timestamps on GBA carts, though it is an interesting point seeing as the DS keeps its own system time. It should not be the case that DS system time is used instead of RTC time, but some testing would be needed to prove that.
It would be interesting to check the status of other date-bound events on your cartridge, such as the TM man in Pacifidlog Town and the number of successful launches in Mossdeep City. However, the only real way to know what's happening and fix it definitively would be to edit the RTC or the save file timestamp using software.
Other possibilities are that you started the new game before replacing the battery or that you've got a reproduction cartridge, but I assume you'd like those ideas cast aside.

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I highly doubt its a reproduction since I bought it from gamestop in like 2008. I checked the mossdeep space center when I first got there at it was at 19 which I found kinda odd.  I also just checked at its still at 19, I made it to mossdeep a few days ago. I do distinctly remember that I started a new game after I installed the new battery myself. Won't be able to check the TM guy for a week since I just went to see him.

Answer 1

This problem happens when your save file's timestamp is later than the timestamp reported by the cartridge's real-time clock (RTC).

When you replace the battery, the RTC is "reset" to zero, but your save file's timestamp stays where it was before the battery was replaced. The game will only update your save file's time if it is lower than the time reported by the RTC, which means you're stuck with a save file timestamp likely years ahead of the RTC's current timestamp.

Since date-based events only work when the RTC is counting ahead of the save file's timestamp, date-based events like berries will never work until the RTC reaches the time on your save file again. Of course, that's a problem, because a) you have to wait and b) that's likely around the time your original battery died. Any guesses when the new one will die?

As stated here, you have three ways to fix this problem:

1. Reset your save file. This will replace the timestamp on your save file, meaning the RTC will count ahead once again.
2. Manually alter your save data to bring it behind the RTC time (and therefore the RTC will be ahead again).
3. Change the RTC timestamp to be roughly the same as your cartridge timestamp, or ahead of it.

The latter two options require access to homebrew or save file dumping, which is difficult to come by for old consoles like GBA. If you have a DS Lite/Phat and a DS flashcart, you can load software (example) onto the flashcart that will change the RTC in the inserted Game Pak. If you can dump your save file, you can change the RTC data using PKHeX. Apparently, there were also GBA flashcarts that would load software onto a GBA console then allow you to insert your cartridge and change its RTC timestamp. I don't know how you'd come by such things in 2022.