You must realize I haven't played all my Pokemon games through. I have seen the credits of Red, Yellow, Gold and White. But that's about it, although I do own Sapphire, Ruby, Diamond and Soul Silver too. So I decided to take up my good old Sapphire again. I wasn't in a good mental condition when I tried to play that one in the first place. Anyways. The game says to me:

The internal battery has run dry.
The game can be played.
However, clock-based events will
no longer occur.

Can you tell me what this means in practice?