let me see if i got this right

you can get 30 to 60 evs in one horde battle (with power items and pokerus)?

example:
horde of gurdurr

2 points for species
+4 points for power item
=6 evs per gurrdurr
*5 gurrdurr
=30evs
*2 because of pokerus
=60evs

am i missing something here?