Question

What are the best locations for getting Effort Values in Defense?

Answer 1

DIAMOND/PEARL/PLATINUM spots:

The best place is probably Iron Island, with Geodude (1 EV), Graveler (2 EVs), Onix (1 EV) and Steelix (2 EVs). There is also Oreburgh Mine, which is good because it has low-level pokemon.

HEARTGOLD/SOULSILVER spots:

Route 45: Geodude (1 EV) and Graveler (2 EVs), plus Gligar (1 EV) or Skarmory (2 EVs) depending on version.

Answer 2

Black / White:

WELLSPRING CAVE:
Roggerola 1 EV
Woobats 1 Spe EV

RELIC CASTLE:
Yamask 1 EV
Cofagrigus 2 EVs
Onix 1 EV
Sandslash 2 EVs

Answer 3

Or Orborough gate. That almosst always has geodude.

Answer 4

i would like to add onto DarthDestiny's post for Black / White: the Durant's in victory road offer 2 def. they are pretty common