Do Pokemon LEGEND count as one Pokemon or two for purposes of bench space, prizes taken, attack effects, Poke-POWERs, Poke-BODYs, and calculating damage?
A Pokemon LEGEND is made up of two Pokemon cards each consisting of 1 half of the Pokemon, but it counts as a single Pokemon while in play; one bench space, one prize per KO [unless noted otherwise on the card] , etc.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)