First one is just a warning message saying that you can only transfer pokemon from the Wii back to the DS cart they originally came from.
Second tells you to select 'Connect to Wii' from the start menu on your Pearl/Diamond.
I have a similar bug. Mario's Down+B move, along with some of Squirtle's B attacks cause my Wii to crash in SSE mode.
In all other modes these moves appear to work.