no sorry
yes if you are a wizard
after beating Red, you can catch the three legendary birds: Articuno, Zapdos, and Moltres. You can also get the Red Orb from Professor Oak to catch Groudon in the cave near the Safari Zone. (If you show Oak Kyogre and Groudon you'll get the Jade Orb to catch Rayquaza.)
I don't think you're able to catch the three deity Pokemon before defeating the elite four.
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
Yes you can catch the three Legendary birds in Platinum but you'll have to beat the game first and to minor side activites before hand
You can catch one of the three legendary dogs; Bulbasaur=Entei, Squirtle=Raikou, Charmander=Suicune. you can catch them in vermilion city, fly to vermilion city and go north, you can find them in the last rows of grasses in the upper part of vermilion,
You can find the main pokemon of the game at spear pillar. In all of the games, after beating the elite four, mesprit, uxie, and azelf are located at the three lakes in the game. I don't know how to catch entei, suicune, or raikou yet.
Yes. Then, after the Dialga/Palkia event, you can go to the lakes and catch them all at level 50.
Nope,I tried but I think it depends on if it's sapphire and ruby or Emerald.. :( Bummer...
Gassing, shooting and beating.
by beating all the missions
That's wrong you can catch regiice at sea foam islands after beating red and regirock at union cave and regi steel at mt. silver and regigigas at the kanto waterfalls you need all three though