Problem with Black 2 exporting save files to Pkhex

[DIMITRI]

So I've been trying to use pkhex (first time) to try and edit some pokemon on black 2, which i play on desmume. After reading some stuff and some videos i thought I had the idea on how to do it, but i can even open my save file in pkhex. I notice in videos, they will have the time amount of in game time they have spent in the game in the corner of pkhex. But min is always 0. I looked into and and sure enough when i import the exported .sav file, it just puts me back into the beginning, but not before having to go through some screen that says "save data size cannot be reliably determined..." with a textbox with some options like AUTO(from current save data size) etc. It says if you have no clue what this is stick with the defaults and thats what i do. Then the screen just goes white and all the save states are gone. Anybody have a clue what the problem is?

[Kaphotics]

Stop using save states, and save in game.

[theSLAYER]

Use the game menu and save twice, as opposed to using the emulator menu to save.