It's a message you'll find in the Pokemon Info.
It basically means that the Pokemon was received at a special event at a place IRL or over WiFi.
If you have a Pokemon that says "Fateful Encounter", it is an Event Pokemon.
You will encounter N many times in Pokemon Black & White.
Increases wild pokemon encounter rate
first get calebi then trade it to Pokemon black or white and the next Pokemon you encounter will be zorah but there is only one chance use it wisely!
if you hack your game you can encounter a level 100 ho-oh
The plains at Giant Chasm. Encounter rate= 15%
u can find him on route 9 after u encounter thunderus.
Walk in grass in an area with thunder + lightning. You'll eventually encounter him.
You can not counter Tornadous in white, he's only in black. The only way to get him is to link trade
To get Zoroark you must have an fateful encounter with one of the Shiny Beasts (Entei, Rakiou etc.) The fateful encounter itself is an event.
The weather begins to become stormy randomly on the routes. During this, you can chance-encounter him
you can not encounter a thundrus in black so you have to trade it from white requiring natiol dex
there is no such thing as a golden Pokemon but if you mean a shiney Pokemon they appear in any encounter zone but there is about a 1 in 2000 chance