Ultra Necrozma Battle

Walkthrough: As you reach the top of Megalo Tower, you will come to Necrozma still fused as one with Nebby. However, just as you arrive, Necrozma will reach its Ultra Burst, transforming it into its third and final form. In this form, Necrozma is known as Ultra Necrozma, having the best total stats than any Pokemon in existence. To make it all the more devastating, its aura will cause every last one of its stats to be increased by one stage when the battle begins.

You will battle Ultra Necrozma at Level 60, having the moves of Photon Geyser, Smart Strike, Power Gem, and Dragon Pulse. Ultra Necrozma will also have the ability of Neuroforce, one that increases the damage done by Super Effective Attacks by 25%. The battle will be the toughest yet on your journey, but after defeating Ultra Necrozma, Necrozma will separate from Nebby and be transported to another dimension. The Ultra Recon Squad you met earlier in Ultra Megalopolis will come to thank you, giving you a Poipole as a gift of gratitude. You will then return to The Alola Region with Nebby.

After arriving back to the Altar on Poni Island, the light of The Alola Region will return. Lusamine and Lillie (as well as Guzma) will depart and return to the Aether Foundation to heal Nebby back to full strength. The Ultra Recon Squad will also depart after saying thanks, allowing you to continue using their Legendary Pokemon to travel through Ultra Space as a token of their appreciation. Once they leave, you can either spend some time traveling through Ultra Wormholes, or you can continue your Island Challenge by taking on your final Trial with Captain Mina back in Seafolk Village.