If you haven't defeated Maylene (the Veilstone gym leader) you need to defeat her. Then you defeat all the other gym leaders up to Candice (the Snowpoint gym leader) and have already been to Lake Acuity and have talked to Commander Jupiter of Team Galactic in Lake Acuity after you've defeated Candice. Then you go to the Team Galactic HQ, defeat Leader Cyrus and Commander Saturn of Team Glactic and press the button which will release Azelf, Uxie and Mestript from the trap. After that you have to go to Spear Pillar which is at the top of Mount Coronet.
Hope this helped!
defeat the admins
it already did i think
Before you can get into the HQ, you have to: - Beat the Gym Leader (Maylene, the Fighting type leader) - Help Lucas/Dawn fight off the Grunts outside the Warehouse; you'll get the Secret Key that the Grunt dropped - Enter the Warehouse After you finish talking to the Looker, pick up the HM Fly and head into the HQ. The Secret Key will let you pass the steel doors. Good luck!
nothing
You can't "find" him. You have to trade the egg from Pokemon ranger over to platinum, where you can hatch it.
To finish the sinnoh dex (Pokemon platinum's,diamond, and pearl dex) you just need to see every Pokemon not catch every Pokemon.
Yes you can
Yes, you can. All you have to do is finish the game and then you are able to trade any Pokemon. like diamond, pearl, platinum, heartgold, and soulsliver.
You can get Pokemon from the older versions on Pokemon Platinum, but I'm not sure if it includes every Pokemon from every game. You'll need to finish your Pokedex, then get the National Dex.
Nah brah
Yes but you only have to get it, not finish it
yes its easy