it depends on what game(s) you are playing.
red, blue,and yellow versions: articuno, moltres, zapdos, (yellow version only)mew
fire red, and leaf green versions: articuno, moltres, and zapdos
ruby, and saphire versions: regice, regirock, registeel, kyogre(saphire), and groudon(ruby)
emrald version: regice, regirock, registeel, posibly rayquaza
gold, silver, and crystal versions: *do not know*
diomond, pearl, and platinum versions: *do not know*
heartgold, soulsilver versions: entei, raiko, lugia(soulsilver), ho-oh(heartgold)
Giratina, and the 3 lake pokemon.
You just get legendary Pokemon I guess
You get a legendary pokemon, to level 100 (trade it).
If you did,just go to the pokemon league then beat the elite four and the champion
It will be very unlikely.
Kyogre only.
Giratina, and the 3 lake pokemon.
You have to defeat the elite four then you can catch the legendary
At 'N's Castle after beating the Elite Four.
beat the elite 4 AND fly to resort area ---- ----
Yes in Pokemon White after you defeat the last member of the elite four you are forced to battle Zekrom. You battle Reshiram if you have Pokemon Black.
Yes you can
You get Reshiram at N's castle after you defeat the elite four.
You just get legendary Pokemon I guess
You get a legendary pokemon, to level 100 (trade it).
If you did,just go to the pokemon league then beat the elite four and the champion
You have to beat the elite four again it works in all games