Whip Cream: In a medium bowl, beat the heavy cream with 1/4 cup sugar until stiff peaks form.
Prepare Cream Cheese Mixture: In a large bowl, cream together the softened cream cheese, lemon juice, vanilla, and 1/2 cup sugar. Fold 2 cups of the whipped cream into the cream cheese mixture, reserving the rest.
Assemble Layers: Slice the pound cake into 18 slices (about 1/2 inch each). Drain raspberries, reserving their juice.
Layer 1: Place one-third of the cake slices at the bottom of the trifle bowl, drizzle with raspberry juice, spread one-fourth of the cream cheese mixture, sift one-fourth of the cocoa powder, and sprinkle one-third of the raspberries.
Repeat: Create two more layers following the same order.
Top Layer: Spread the remaining cream cheese mixture, then top with the reserved whipped cream. Sift the remaining cocoa over the top.
Chill: Cover and refrigerate for at least 4 hours before serving.
Enjoy this indulgent and elegant dessert!