DraStic

just copy your current save file(Pokemon Black Version 2.dsv), located at sdcard/drastic/backup folder and move it to your new phone. save file location should be the same.

under general setting there is option called Landscape Layout rotation (default is auto)
simply just change it to Landscape then restart drastic and your problem is solve.

i'll try to answer your question.
on my phone drastic save file located at sdcard/Drastic/Backup folder.
just to be sure make ingame save on your desmume and then just place .dsv file on your drastic backup folder.
i dont know about save state but ingame save work flawlessly.

i tested it earlier ...

to trigger keldeo resolute form event, first you need to caught 3 legendary horses : Cobalion,Virizion,Terrakion after that put them and keldeo in your party then go to Flocessy Town.
there is a Big Rock behind alder(champion you meet earlier in the game) house. just touch it then keldeo want to out ...