yes, they can all be patched to be played on devices with no RTC support. You can do the following:

- Download GBATA (http://www.gbadat.altervista.org/tools.htm). It has a RTC patching feature (Clock Fix tab) built-in. It is only for Ruby/Sapphire though. However it can also apply IPS patches. You can download "clock fix" IPS patches for the other pokemon games from here:

http://bubbz.pocketheaven.com/?system=gba&section=patch

and here

http://www.advanscene.com/ (search for pokemon)

Hope this helps.

 

just fyi, Fire Red and Leaf Green don't have a RTC so no need to patch those.

 

i can't find the clock fix anywhere, on that site or on teh net. can someone point me to one for emerald plz!