you cheat
you cant get every legendary of Pokemon without cheats or migrating and trading with people
No not every pokemon. You can't catch the starter Pokemon and many of the rare pokemon, you have to trade with Diamond. sorry ...
impossible. u cannot get dialga without trading from a diamond game but the rest u can do.
No it does not have every Pokemon you can get more types of Pokemon by trading at the GTS or without wi-fi at the second floor of the Pokemon center with the middle lady. hope this helps ;)
You cant get every pokemon in Black and White without trading, unless you trade from Emerald/Ruby/Sapphire,Fire Red/Leaf Green to Diamond/Pearl/Platinum and/or Heart Gold/Soul Silver and trading the pokemon to your Black and White games from there. (Or you could just hack, but that can corrupt your game.)
You can get 1 master ball every time your Pokemon trainer ID number matches the lottery number perfectly, but it is very rare and their is no other way.
You have to complete your pokedex the oak gives you a call
catching them trading them and......
You go round all of sinnoh and see every pokemon. It is easy to complete but will take a long time. You will not be able top catch them all without trading but you can complete it without trading
For first generation trading you need to pass all of the gyms up to a point. Then a man will come and install the one to the far left then you can trade with Red, Blue and Yellow. Just check into the Pokemon healing building after every gym you defeat.
using the Pokemon cloning technique save before you get the first and second Pokemon but save after you get the third Pokemon. you have to vs your rival, take back the egg and have at least two Pokemon. you will be able to control all three Pokemon cus technically they were all owned originally by you. you must not save after you get the first and second Pokemon. that's it. Enjoy
NO:I have beaten,caught,traded,and evolve every Pokemon's in the game and never seen manaphy as a wild Pokemon's also Lost it. you can trade from one of the ranger games (if you get it and beerd with a ditto (you can get ditto right below golendrod in heart gold odr soul silver) you will get a phion egg