Until November 15th, 2018, players of Pocket Monsters Sun, Moon, Ultra Sun or Ultra Moon can still receive Pikachu, Eievui and Cuwawa as a present on their birthday at the Pokémon Centers in Japan. Starting on Friday, November 16th, 2018, Lucky will be given away to players on their birthday via a serial code for Pocket Monsters Let's Go Pikachu or Eevee.


Source: https://www.pokemon.co.jp/gp/pokecen/birthday/