If an opponent's evolved Pokemon is Knocked Out while Gengar is Active, does the "Catastrophe" Poke-BODY put all of the evolution stage cards and Basic Pokemon card in the Lost Zone, or just the highest stage Evolution card?
The evolved Pokemon and any of its pre-evolved stages and Lv.X cards go to the Lost Zone, and all attached Energy, Tools, etc. go to the Discard Pile.
Source: Triumphant FAQ (2010-11-04), PUI Rules Team (2010-11-04)

Relevant cards

Note: All applicable cards may not be listed below.
HGSS4_94