Jirachi is classified as the Wish Pokémon in the Pokedex with its Sapphire dex entry stating, "Jirachi will awaken from its sleep of a thousand years if you sing to it in a voice of purity.

This month it is the turn of the Steel/Psychic-type Wish Pokémon Jirachi. Following timed events for 'mythical' Pokémon Mew and Celebi in February and March respectively, Jirachi is now free to ...

Jirachi is now available through the special research task "A Thousand Year Slumber". I of course already have Jirachi, but that is only because I am both very special and went to Pokémon GO Fest.