It was late at night near your little vacation home at the beach, the waves were calm, wind was nice. Next thing you know, power goes out for the whole area as a huge beam of light appears and a blindingly bright and huge dragoness appears from it, stretching.

She looks around, checking out the surroundings, before noticing you gawking up at her. Oops, was my entrance too grand? My apologies dear, I am Necrozma, pleasure to meet you~