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The best Ultra Beast is Necrozma, and unlike the other Ultra Beasts, this one went around pillaging light sources from different planets until it was finally stopped and defeated in Alola by the Tapus when it tried going after Solgaleo/Lunala, which help bring out the sun/moon in the region. In this TCG art you can see Necrozma pillaging a city for any light sources it can find, no matter how small or if they're artificial. In Necrozma's dex entries, it is stated that it has started to go into withdrawals that causes it to have painful headaches from being dormant for so long without light. You can see it react violently to them in it's ingame idle battle animation. Why was there no Necrozma movie?