I don't really like the RMT forum here tbh, they require like 5 paragraphs for each Pokemon for the following:Or rather... going into the RMT forum =x Though marthy is entirely correct.
Vratix: No Fighting-types enjoy switching in, but you can use Spore Breloom to put it to sleep, Megahorn Heracross to kill it, or Swords Dance (Night Slash or X Scissor) Gallade to hurt it, though you have to be careful of status.
Why did you pick them
What role are they serving (moves and EVs tell you that already)
What can they do to threats (read above)