Question

What are the best locations for getting Effort Values in Special Attack?

Answer 1

DIAMOND/PEARL/PLATINUM spots:

By far the best place is the Old Chateau, where it is 100% Gastly (1 EV) or Haunter (2 EVs) as you walk around.

HEARTGOLD/SOULSILVER spots:

Surf in Ilex Forest to find Psyduck (1 EV) and Golduck (2 EVs).

Comments

Also if you are at the old chateau night (change the time of day if lazy) and you have any gen 3 games in the ds as well you can fight gengars.

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HG/SS: Sprout Tower at nigth - 95% Gastlies

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You can also find Psyducks and Golducks in the pond (surf required as well) in the route right above Goldenrod City, but slightly higher leveled.  (quicker level up?)

Answer 2

Black / White:

CELESTIAL TOWER:
Litwick 1 EV
Elgyem 1 EV
(lower floors are more likely to be Litwicks, while higher are more likely to be Elgyems)

Answer 3

Also in White

White forest has Mareep, Abra, and Ralts at the point i am also it can have Ghastly and Oddish