Internal battery has run dry - what to do?

I have a an emerald version and a crystal version that both say the battery has run dry, and all time based events in the game no longer work (something like that.

Is there a way to fix this? Wanted to play again after 15 or so years.

I have a an emerald version and a crystal version that both say the battery has run dry, and all time based events in the game no longer work (something like that.

Is there a way to fix this? Wanted to play again after 15 or so years.