As far as I know, the original World Link shouldn't even have Swift Shards, so you're most likely playing World Link 1.8. There is a difference between World Link versions.
As for getting Dark Alice in WL 1.8, the only way you can get her is by trading Chibi Alice. You can do that via VBALink by trading with yourself and then trading back. Other than that, there's no other legitimate way of getting Dark Alice in that game (I don't think they have an in-game Alice trade). Same applies with trying to get Tenma and Sendai (not 100% sure, since they do have Chibi forms in that game).