Heartgold Problem

So in my heartgold game every time i visit violet city for the first time the bottom screen on desmume icons disappear but the words like "Pokemon,Pokegear,Bag" etc. still appear. And when i travel far enough in the city a black void appears and some characters are floating. When i enter buildings the game goes black i cant leave or advance in the city please help!

try patching the rom using ds secne rom tool or find a suitable HG rom from this thread
and try using desmume emulator.try searching Heartgold in this forum and you will a get a whole ot of similar thread which can help you .