How come you cant catch much legendarys in black and white version 2?

Question

how come black and white version you can catch lots of legendarys but in black and white version 2 you can capture a few like cresselia,uxie,azelf,mespret,latios/latias,white kyurem/black kyurem,reshiram/zekrom, and the regis that not alot in black and white you can catch more such as suicune and stuff I think I have seen vidoes catching suicune and lugia also rayquazza my favorite Pokemon please help me

Answer 1

Referring to the second part of your question, these (look at the "Legendary" part) are the only ones you can catch.
And the reason why we can catch more legends is that Game Freak wanted it to be like that. However, a possible theory is that they wanted the game to be more appealing to the people who bought the game.