Depends on the legendary pokemon. If it's something like a Raikou or Entei, you probably can't. Giratina, you can go back and catch/beat him. Deoxys, I don't think you can. Latias/Latios, egh, maybe not. Sorry if there's another legendary that you mean, but that's all I can say for now.
You can't. If you killed it, it will be gone forever. That's why you should always save before a legendary encounter.
Go to the museum in nacrene city talk to the lady on the left near the entrance she will make a fossil a pokemon.hope it helps.
Yes, there is if you bring the three legendary birds Zaptos ,Moltress and Articuno and ,bring it to 4th F the legendary Pokemon appearing is Lugia which can be captured! Source: Tried in white 2 and black 2
There is no legendary Pokemon in Undella Bay.
It's not possible, legendary Pokemon cant be bred.
There isn't a legendary Pokemon That is fire and Bug but there is Reshiram and Victini
You can only get it with an event.
Yes, there is if you bring the three legendary birds Zaptos ,Moltress and Articuno and ,bring it to 4th F the legendary Pokemon appearing is Lugia which can be captured! Source: Tried in white 2 and black 2
There is no legendary Pokemon in Undella Bay.
there is no "white" legendary in pokemon white. its black ( and called zecrom) and in the top floor of N's castle and then after u VS N
Zekrom.
White Kyurem
It's not possible, legendary Pokemon cant be bred.
on pokemon black version u get the legendary pokemon reshiram!(sry if its spelt wrong) and in white u get zekrom! u get the legendary after u defet the pokemon ledge.
No.
no
volcarona may not be considered to be a legendary as it does infact evolve from a Pokemon called larvesta, but the Pokemon volcarona is considered to be a legendary Pokemon.
The legendary mascots for Pokemon Black is Reshiram the white dragon one. Pokemon White is Zekrom the black dragon one.
There isn't a legendary Pokemon That is fire and Bug but there is Reshiram and Victini