Legendary: Lunala. Moonbat ftw.
Rayquaza, Kyurem, Tapu Lele, Glastrier and the Lati's are high up there too, but Lunala just has more appeal to me.
Mythical: There's a lot I really like. Mew, Celebii, Jirachi, Deoxys, Victini, Diancie and Zeraora stand above the other mythicals for me.
Can't decide between Jirachi and Zeraora.... 😅