@Level 51: Hi! I heard you're interested in learning VGC. However, due to the nature of VGC, the format it's played in changes every year - the current format will last only a few more months before it changes at the start of next year.

@Level 51: Therefore, the best thing I could find for you is this guide on the differences between Singles and Doubles play, which should hopefully serve as a primer to the VGC format in general. You can easily google more resources about each specific format (this year's is VGC '17).

@Level 51: http://nuggetbridge.com/articles/differences-single-double-battles-pokemon/

@Level 51: That website's kind of old so the background is broken but the text is still readable