Do this to get Giratina in Emerald!
Step one - Start over on your game
Step two - Do the chicken dance
Step three - Fail your English class
Step four - You get Giratina in Emerald!
Lolz, I feel no sympathy for any poor sapp who tries this. If they're that incredibly stupid.
I might actually try that sometime...
How to access the REAL Old Chateau
Warning: This is a long and very complicated glitch. Test at your OWN RISK!
1. Get all 493 Pokemon in the Pokedex, plus win the Game.
2. Restart your Game.
3. You just lost the Game.
4. Now that that's over with, name your trainer "Haunted"
5. Name your rival "Mansion"
6. Get a Piplup and name it
PILP "or"
7. Catch a Bidoof and name it "Bust".
8. Go to Professor Rowan's lab.
9. Instead of Professor Rowan, you will see a strange man in a black cloak. He will give you the Mansion Pass.
10. Go to Backlot's Mansion and go in the right-hand corridor.
11. You will see a set of stairs accompanied by several transforming portraits. Pay no attention to those - they're not important.
12. You should end up in the attic of the mansion. There's a lot of crap inside, but there is a hatchet on the ground somewhere.
13. Pick up the hatchet. The message should say "Haunted obtained the HATCHET! Don't get any ideas..." If you do not get that message, you must be a very trustworthy person.
14. Go downstairs and exit the mansion.
15. Go to Eterna Forest. Make sure your Mansion Pass is still with you.
16. Show your pass to the cloaked man at the door. He will let you in.
17. Go up the stairs and turn left, where you would normally find the Old Gateau.
18. A woman should be there. Give her the hatchet, and she will try and kill you with it.
19. Chuck a Master Ball at her and say "LOLHAX" into the microphone.
20. You have obtained a level 100 CONSTANCE and access to the REAL Old Chateau!