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In Pokemon Platinum, you don't battle Cyrus at Spear Pillar. Instead, you fight him in the Distortion World. After beating him, Cynthia heals your Pokemon and then you battle Giratina.
stone pillar after beating Cyrus
You can catch Rotom after you beat the Eterna City gym. Just go to the Old Chateau at night with a Pokemon that knows Cut and go in. If your game is set to a time between 8pm and 4am then go thump the TV and Rotom will apear
you go to mt cornet
After beating Cyrus at Celestic Town, Cynthia's grandma will give it to you.
on spear pillar, you catch it after beating Cyrus the second time.
After beating Cyrus on Mt. Coronet, surf to the caverns on the the three lakes. You can catch Uxie and Azelf here. When you meet Mesprit, it will flee. You will then have to run all around Sinnoh to catch it, and it will move if you fly. Hope that helps. the credit goes to maegirl77
Dialga is the legendary Pokemon that appears on the opening screen. After rescuing the legendary trio from Cyrus, it will appear on mt coronet. It is a steel/dragon type Pokemon and will know roar of time.
there is four legendary Pokemon you could catch first you need seven bagdes go to the top of mt. coronet and beat Cyrus you will see the Pokemon palkia is a legendary Pokemon after that go to the lakes and you could catch azelf mesprit and uxie which are legendary Pokemon note-i did not use uppercase letters
The final battle with Cyrus is held on the highest point of Mt. Cornet. He tries to summon the legendary Pokemon to rewrite the universe. Cyrus disappears after his defeat leaving Team Galactic to Saturn.
go to top of mt coronet (hope you got master ball!!!!!!!)
You have to be in distortion world and battle Cyrus. The Pokemon that Cyrus sends out are all weak against rock type moves. He has a sneasel a crobat and a hounchkrow. Defeat him and he will give you a master ball. Follow him and he will tell you where the legendary Pokemon are