Dusk stones/shiny stones/ dawn stones/and oval stones are items that make certain Pokemon evolve. You can get A dusk stone in the galatic building in veilstone city. you evolve happiny by giveing it...
I know that eevee will evolve if you use dusk stone on it at night murkrow will evolve into honchcrow misdreavus will evolve into mismagius nidorino will evolve into nidoking nidorina evolves into...