How do you catch tornadus?

Pokemon do not "like" any form of pokeballs. If it is finding Tornadus that's the problem, he's in the south in the morning, and north in the evening. He changes routes quickly, I suggest moving between two routes or a city and route. If it's the actual "catching" that's the problem, using "Mean Look" (used by a Pokemon stronger and faster than Tornadus) will prevent Tornadus from fleeing. Just weaken it and spam whatever style pokeball you'd like (Dusk Balls are great at night, otherwise stick with Ultra Balls).

Heres a hint to find him:
In the Morning Routes around Striation City
In the Afternoon Routes around Nimbasa City
In the Evening Routes around Mistralion City
At Night Routes around Opelucid City
At Late Night Routes around Undella Town

Or I can Make an Action Replay code for one

Spring Afternoon lasts longer
Summer Afternoon lasts longer
Autumn Late Night Lasts longer
Winter Late Night lasts longer
Hope it helps!!!
Victinirules0000

Here is a good video about how to catch him.

To catch Tornadus you go to mistraltion city in the evening then go to iccerus city but you will be blocked by a storm which an old lady will get you inside when your done blabbing go outside tornadus will appear but the problem is if you find where he is by looking at the bulletin board you have to RUN OR WALK you can't bike or he will move you can't fly you have to RUN OR WALK but worth your time