Can't migrate pokemon from emerald to diamond

that may be the problem without that the time cant remain so yes fix ur battery with a new, do not do it by ur self,

that battery has a clock stored inside of it. if it runs dry ur clock will not run.

When you get the message"Internal battery has run dry, the game can be played, however clock-based events will no longer occur" mean a glitch inside the coding of R/S/E games has been activated, stopping the internal clock. So AKA It does not see the time between migrating as 24 hours, Lilycove Dept. store no longer allows lotto tickets, berries don't grow, the berry master doesn't give berries out, no more migrating...etc.

Try putting the game pak in a gba, then firered or leafgreen into another, press select B on the leaf green pokemon title screen and followe the directions. a similar one is in emerald though it wont fix itself. Try pokemon colluseum pre-ordered CD.