Inchworm is DSiWare. DSiWare ROMs are rarely dumped, and the roms that are dumped are unplayable since no emulator exists. Also, read the rules. Don't ask for roms.
I personally spoke over email with Bob Sabiston, the creator, and he told me that as soon as he is sure he doesn't need it anymore, he will release the beta DS rom (which is playable) to the public, or at least give it to anyone who asks. I'm not sure when this will be, and I am most certain that it won't be for a while.
He also said that the conversion from DS to DSiWare is frankly quite easy, and there is little difference in the code. (hint hint)