Sky drop is supposed to null the effects of rage powder aimed at the sky dropped pokemon, according to Bulbapedia:
I sky dropped their amoonguss after it rage powdered. I attempted to hit their other pokemon with a move, and it ended up being rediected into the sky dropped amoonguss instead of hitting.If the center of attention is taken into the air by Sky Drop, it no longer draws moves, even moves that can hit it while in the air.