I know that in double battles, Surf, Rock Slide and generally any move that hits more than one target has its power nerfed (I think it's a 1/3 drop?)
My question is, does it get full power if there is only one target to be hit (such as when the opponent is on their last Pokémon, or if their other Pokémon already fainted?)
Similarly, if it misses all other targets, does it get its normal power against the one it hits?