Hello! I got some problem and i can't solve it by myself(

Game works perfectly, ty for that, but...
As i know there is chance to encounter 3d Generation Pokemons in Pokemon Platinum with gba cartridge inserted.
I didn't beat the game so i can't use pal park, i just want to catch some pokemons.
And gba slot dongling isn't working for me(

I'm using new Desmume 0.99 and i used alot of roms; i tried that method by SpectreMonkey.
Still nothing(
(When i'm trying to "Use external Bios images" - emulator just crashes. Ar code didn't help too.)

And i even don't know what to do, i'm not a tech guru as u guys.

Please help me!
(Maybe i need to download some stuff al'a svn, c++, bioses? i really don't know;
Or MB u can give a link to upload roms which would work?