Too bad Groudon is catchable without a master ball.
It is FREAKING hard though! I did the same thing on Ruby (some other Poke though)
I caught Rayquaza with a regular old Pokeball and used over 60 of my Ultra balls when trying to catch Groudon. I never ended up catching it, and now I started Ruby over :P --- in the name of MAD, you gots to move like Jabba! Official Flareon of Pokemon boards, PB2 FC: 4384-9811-8600