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Trailer takes place at night.
It starts with the UBs coming out of wormholes and invading the smash world lead by Necrozma. They start fighting with smash characters. Then the cameras moves to a corner where Type Null is, it's really dark so we can't see him, but you can hear the sound of chains and angry doglike sounds. We also see his eyes. Then it goes back to the battle and the UBs are winning.
Then the camera goes back to Null but this time we can see him. He is standing like a dog ready to atack, he is making a lot of noises, suddenly the chains break and everyone stops fighting and starts looking at him. Then the mask breaks and we se Silvally, his crest and tail start glowing and he growls to the sky.
Then we see his splash see, "Silvally joins the fight" or something. Silvally runs to fight the beasts and we are shown some gameplay.
Then we are back at more cgi. The beasts are defeated and Sillvally with the other smash characters look tired. Then the cameras shows Necrozma and he becomes Ultra Necrozma, we see all the smash characters and Silvally ready to fight and we see some gameplay of Ultra Necrozma's boss fight.
Then we are back at cgi and we see Sillvally rushing at Ultra Necrozma , he juntos to atack and the trailer ends when they are about to crash, similar to Dks.