How do you get thundorus in Pokemon White version?

Answer 1

First you go to Mistralton City and go north until you find the tall grass with the trail above it and walk on the trail. Be careful not to fall of but if you do there is a second trail if you walk ahead. When you get back on the trail follow it until you found a house. There will be a women there who invites you in and tells you about Thundorus. She will offer you soup. Whichever answer you choose, she will still give it to you. When you are done you can leave but the woman in front of the telvision there can heal your Pokemon. After you leave, your character will hear a sound and find that it is Thundorus. It will circle around you and then fly off. I do not know exactly where to go after that but in the cities there are electric bulletin boards. There also some at the beginning of the routes. They will have reports of thunderstorms near the city or in the route. If there are thunderstorms there go into the tall grass and you will eventually be leaded to Thundorus. If you cannot find any signs with reports of thunderstorms check all of the routes until you get to a thunderstorm. Good Luck! There are also videos to get Thundorus and Landorus on YouTube but they were not made by me. Other legendaries can b found in different Youtube videos. Gotta Catch 'em All! Pokemon!