Can Winged Kuriboh effect be activated when it is special summoned during a battle phase?

Yes, the effect of "Winged Kuriboh" can be activated when it is Special Summoned during the Battle Phase. "Winged Kuriboh's" effect states: "When this card is Special Summoned: You can target 1 monster your opponent controls; negate the effects of that target until the end of this turn." This effect does not have any restrictions on when it can be activated, so it can be activated during the Battle Phase.