system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Did Darth Sidious ever actually train Darth Vader in the dark side? Also, did Vader intend on eventually challenging his master?
gpt
Even a lap dog isn't going to be much good if you can't teach it to attack something when needed.  There's much to be said about Darth Sidious, to be sure, but the man was nothing if not practical; everything he did served a purpose, or forwarded some kind of goal.  While it's unknown if Vader used any powers exclusively granted by the dark side of the Force, it's only common sense that there was at least some instruction in the philosophy and the mentality of the dark side, stretching all the way back to Vader's time with the Jedi.  And as far as usurping Sidious himself goes, I'll just leave this here:

> "You can destroy the Emperor.  He has *forseen* this.  Join me, and together we can rule the galaxy *as father and son!*"