Is it still possible for me to get Lunala in Ultra Moon after beating the game?

Question

This was my first DS game, so I didn’t really know how it worked. Anyway, I received the Master Ball but didn’t use it because I assumed it had some sort of importance to the plot and that someone would tell me when to use it. But apparently not. I would just restart, but I got a shiny Zygarde and I don’t want to lose it. Is it still possible for me to get Lunala?

Answer 1

In Ultra games, Solgaleo/Lunala are not required catches during the story. Instead, after Ultra Necrozma is down, you can go visit them to battle at any time (until you catch it), en route to where you would encounter Tapu Koko. This includes after beating the league.