>>29845412Solgaleo, Lunala, Necrozma and all the UBs learn their moves at the same levels. But just for comparison:
Solgaleo, Lunala and Necrozma
Lv 7: Iron Head, Night Shade, Slash
Lv 13: Metal Sound, Confuse Ray, Stored Power
Lv 19: Zen Headbutt, Air Slash, Rock Blast
Lv 23: Flash Cannon, Shadow Ball, Night Slash
Lv 31: Morning Sun, Moonlight, Gravity
Lv 37: Crunch, Night Daze, Psycho Cut
Lv 43: Metal Burst, Magic Coat, Power Gem
Lv 47: Solar Beam, Moonblast, Autotomize
Lv 53: Sunsteel Strike*, Moongeist Beam*, Stealth Rock
Lv 59: Noble Roar, Dream Eater, Iron Defense
Lv 61: Flare Blitz, Phantom Force, none
Lv 67: Wide Guard, Wide Guard, Wring Out
Lv 73: Giga Impact, Hyper Beam, Prismatic Laser
Solgaleo and Lunala evolve at Lv 53 and learn their signatures upon evolution, so they're not listed at 53 but that's how it works.
Aside from the levels there's no thematic connection between Necrozma and the other two.