there is also thundarus tornadus and landarus
No, Celebi or any other Legendary Pokemon can't have an egg.
No. its is like pearl and diamond where you can only get one of the other depending on the version. on Pokemon white you get the black orb so you can get the legendary Zekrom, on Pokemon black you get the white orb so you can get the legendary Reshiram.
uxie dialga arceus palkia giritina mesprit manapy
Reshiram. But if you make any other Pokemon stronger than it by level, yes, then it will be that Pokemon. But if you look to it by the side of legends and legendary power, it is Reshiram.
Pokemon Black and White are not compatible for trading with any of the other previous games.
well actually this game isn't the same as the old Pokemon games. in the other games you beat the team and get the legendary before the elite 4 but now you have to beat the elite 4 and then you can get either reshiram or zekrom
you get zekrom in Pokemon white version and resheriham in Pokemon black.(in my oppinion, it should be the other way around, zekrom in Pokemon black, and resheriham in Pokemon white version) IT IS JUST LIKE PUTTING DIALGA IN POKEMON PEARL AND PALKIA IN POKEMON DIAMOND.
No u can't
Once, you have caught one, it's the same as any other Pokemon. Yes.
In Pokemon black/white you must have all the badges and catch tornadus/thundurus and get someone to trade the other legendary( ex. if you have white, get someone to trade for a tornadus). Than goto the shrine with both the legendary pokemon in your backpack and landorus will come out of the sky. Save then fight. Source: me got him a long time ago.
The best Legendary Pokemon with the best stats is none other than Mewtwo.
You can not catch Groudon in black or white but you can trade for it and for the other legendary pokemon! But you need really awesome pokemon to trade for them. Nobody gives out rayquazas or groudons or zekroms for nothing you know! I hope I helped!