If anyone wants to catch Rayquaza on Heart Gold version (and needs Groudon to do so), I'll gladly help by offering Groudon.
My Soul Silver friend code is: 4985 9578 7795, and the times I will be available to initiate the trade are during:
Tomorrow - From 8:00 A.M. to 1:00 P.M.
Friday - From 11:00 A.M. - 6:00 P.M.
Sunday - 9:00 A.M. - 4:00 P.M.
Monday, Wensday, Friday - 11:00 A.M. to 6:00 P.M.
Saturday - 8:00 A.M. - 6:00 P.M.
Literally any Pokemon will be accepted in return for Groudon. If you want him, send me a PM or a reply post on this thread.