Hi, we're in the midst of figuring out what you're saying. Do you mean Effort Values gained from defeating them or Base Stats distribution?
If the former, Marshadow gains 2 Atk and 1 Speed EV, while Volcanion gains 3 SpA EVs. If the latter, Marshadow is 90/125/80/90/90/125 while Volcaion is 80/110/120/130/90/70, both totalling 600.