Where do you go after you go to all 3 lakes on Pokemon platinum?

After you go to all 3 lakes in Pkemon Platinum, you go through Mt. Coronet to get to Spear Pillar. You will probably need people that know rock climb, strength, surf, and maybe rock smash. you climb all the way to the top (be careful there are galactic trainers). once you get to the top you have a double battle with rival against mars and Saturn. you go through to giratina's domain (i cant rememeber the name). You have to walk around a lot, then u have a battle against Cyrus, then after that u battle giratina. be careful: Cyrus has a tough team. you should get a lot of dusk balls, ultra balls and time balls for giratina.