try swamperttools.webs.com its a pretty good place for all generations of Pokemon ROM hacking tools
Chat with our AI personalities
you carnt without cheating our hacking/codes
Google is your friend, as well as "pokecommunity", they have a good tool box that has lots of ROM hacking tools for all the generations
http://crystalfallows.110mb.com/AutoIndex/index.php?dir=tools/RBY/ hope that helps also you can have a look around www.pokecommunity.com for great hacks and tools.
you cant get reggiggas in Pokemon emerald
there is no mist stone in Pokemon emerald