If an Unown-Q is put into the Lost Zone while it is attached to a Pokemon as a Tool, would it count toward the 6 Pokemon needed for a player to declare themselves a winner when "Lost World" is in play?
Yes. Once it is no longer in play, it reverts to being a Pokemon card again.
Source: Call of Legends FAQ (2011-02-10), PUI Rules Team (2011-02-10)

Relevant cards

Note: All applicable cards may not be listed below.
COL1_81