When playing online against others, I notice that Pokemon above the level of 50 are rounded down to 50, and Pokemon who are below 50 remain the same. So when playing online, are all your EVs on your Pokemon rounded down to what they were at 50? I'm unsure as to what I need to do to maximize my Pokemon's statistics before I play online.
Example: I have a Vulpix. I will level her up to 50. Should I go any further? Like will any statistic I gain (other than moves) after 50 matter when I enter online battles?