Board Thread:General Discussion/@comment-33255176-20171006013144/@comment-32182236-20171009121143

...She decided to hang out in the garbage dump AFTER she was a scientist, after Mettaton made it big and she failed with the Amalgmates-Entry 21 in the True Lab tells us when she moved to the garbage dump.

Alphys would have worked with Gaster BEFORE all of that. After Gaster fell though, there was no Royal Scientist left-In fact, the whole world was changed so that there NEVER was-But evidence of his existence, the things that he did still remained-The CORE still existed, after all-So too did the Gaster Blasters still exist.

Perhaps her work with Gaster is how she learned to make a robot in the first place! (She did make Mettaton, the full body- it's only the SOUL she didn't make:Happstablook.)