How do you get Deoxys, Arceus,Shaymin, and Giratina WITHOUT mystery gift?

Giratina is the only one you can capture without a Pokemon event or cheat code.

You can catch Giratina in:
1. Pokemon Diamond & Pearl in Turnback Cave at lv. 70.
2. Pokemon Platinum in Distotion World at lv. 48

All the other can only be caught or received through Trade, Pokemon Event, or Cheat Code

You can't get Deoxys, Or Arceus the flute thingie, then go to mount Coronet and play the flute on the tile with the flute on it, Shaymin you need that flower and you just go to a certain place (Sorry I haven't played Diamond/Pearl/Platinum for so long already, too kept up in W2) and Giratina you only need to go to the Route Below Hearthome once you've gotten the National Pokedex, Darkrai, and Creselia, go down and on the right side of the road there will be an opening in the trees, go past there and through the obstacles (Water, waterfalls Etc) and into the cave (Turnback Cave), explore it, eventually you'll find him at Lv70, catch him, and use an escape rope to get out! For the others you need to do a pokemon Event at some place like Gamestop or trade it, otherwise it's impossible

HAX is the only way!

Deoxys, Arceus, and Shaymin: No way to get this without Mystery Gift.
Giratina: Can be get on Sendoff Spring and Distortion World.

I didn't get them