Gen 6 Trash Bytes? PID?

[Kinkedo56]

I'm trying to make a legal Wish Chansey on Pkhex and it brought back the memories of doing a bunch more steps.

I don't hear anyone talk about trash bytes anymore during their genning. Do I still have to /FFFF/0000 and all that on the Pokemon's nickname on Pkhex or is that no more? I also remembered how only certain PIDs were possible for specific IV spreads but I heard that they changed this in Gen 5 and all PIDs were ok. Is this why everyone simply presses the random PID button without care? Would it make a difference if I were to directly make this on my Gen 6 game as opposed to genning it on Gen 3 to then transfer upwards to my game?

Edited June 5, 2015 by Kinkedo56