You dont
Do you mean Thundurus? Thundurus cannot be in the wild in Pokemon Black, but you can trade for it or wait a Mystery Gift Event.
You can't get Tornadus on Pokemon White. Tornadus only appears in Pokemon Black and the only to get it is to trade it from Pokemon Black.
a pokemon in pokemon black & white. similar status to Thundurus
You can't without trading with someone that has black.
Legendary pokemon exclusive to Pokemon White players are Thundurus and Zekrom.Other (officially released) Legendary pokemon found in White (as well as Black) are:CobalionTerrakionVirizionVictini (wifi events only)Tornadus (Black only)Thundurus(White only)Landorus (only when both Tornadus and Thundurus are brought to the Abundant Shrine)Kyurem
You'll need to trade for it or wait for another event for Pokemon Thundurus, because you can't get Thundurus in Pokemon Black.
Thundurus is version exclusive to Pokemon White, you'll have to trade.
Specifically with only White, you can catch: Zekrom, Thundurus, Cobalion, Terrakion, Virizion, Kyurem without trading or events. By trading with Black, Reshiram and Tornadus become available. If Thundurus and Tornadus are in the party, Landorus is available. Keldeo, Victini, Meloetta, and Genesect are event exclusive, although they can only be found by hacking currently except for Victini.
There is no way of getting all beginner Pokemon without trading.
Do you mean Thundurus? Thundurus cannot be in the wild in Pokemon Black, but you can trade for it or wait a Mystery Gift Event.
You can't get Tornadus on Pokemon White. Tornadus only appears in Pokemon Black and the only to get it is to trade it from Pokemon Black.
a pokemon in pokemon black & white. similar status to Thundurus
You cannot get Thundurus in Pokémon Black, the only way to get it in Pokémon Black is by arranging a trade with someone else in order to get Thundurus. Thundurus is a Pokémon that is exclusive to Pokémon White however its counterpart, Tornadus is available in Pokémon Black.
You cannot catch Thundurus in Pokemon Black, he is exclusive to Pokemon White.
You can't find thundurus in the wild in black. You need to trade one over from white version or GTS.
You cant without action replay
You can't unless you picked it as starter pokemon.