"TheAverge number of moves to solve white cross: 5.81
Averge number of moves to solve dual cross: 5.39
Averge number of moves to solve neutral cross: 4.81"
I don't know of a video off hand, but you should be able to figure this out yourself... I mean you should know the opposite colours at least (white - yellow; green - blue; red - orange, on a typical cube). After that I wanted to learn how to put the centers on my 4x4x4, so I just learned the colours in a clockwise pattern looking at one face (not most efficient, but gets the job done). I normally scramble and with white top and green front, so I just looked to see that red is on the right, clockwise the letters are: GWR. I put words to it and now remember "Green While Radioactive". So when solving my 4x4x4 I put green front and white top and know red needs to go to the right (if orange is there, I need to switch). I also recall a video mentioning "Blue Mustard Blood" (for blue yellow red, remembering by colours instead of letters, which may be better). Hope this was understandable and helpful.
Where can I find a good speedcubing method for Pyraminx? I already know the no-algs method (not sure what it's called) but that is clearly not a speed method.