Jirachi — 60 HP — [M]
Basic

[C] Stardust: 10
Discard a Special Energy attached to your opponent’s Active Pokémon. If you do, prevent all effects of attacks, including damage, done to this Pokémon during your opponent’s next turn.

[M][C] Dream Dance: 20
Both Active Pokémon are now Asleep.

weakness: [R]×2
resistance: [P]-20
retreat: 1

Illus. Naoki Saito
XY Promos — XY67a — Promo

It is said to have the ability to grant any wish for just one week every thousand years.