Kartana and Celesteela's respective codenames are UB-04 Blade and UB-04 Blaster. That leaves Xurkitree and Guzzlord (the remaining two UBs) as UB-03 and UB-05 respectively.
So there will be a total of 5 Ultra Beasts in each game?
Based on the leaks, Necrozma does have the same ability as the other Ultra Beasts (Beast Boost), so I do consider it an Ultra Beast, just not like the others.
Something's telling me that Necrozma is going to be the third version mascot if there is to be one.
Based on the leaks, Necrozma does have the same ability as the other Ultra Beasts (Beast Boost), so I do consider it an Ultra Beast, just not like the others.
Something's telling me that Necrozma is going to be the third version mascot if there is to be one.
As Ewery1 said, Necrozma is not an Ultra Beast since all UBs have the exclusive Beast Boost ability and Necrozma instead has Prism Armor which is a Filter/Solid Rock clone.