HGSS: Pokewalker question

I read somewhere that when you buy the original game, you get a pokewalker that can get you some new pokemons and items. My questions are:

1.Is it the only way to get some pokemons in game?
2.Can you buy it separately or you need to buy the game to get one?

EDIT: Lolwarning. The beginning of the post was deleted.

1) With some, yes.
2) You need to buy the game to get one.

http://store.nintendo.com/webapp/wcs/sto...Preference

Pokewalker

http://store.nintendo.com/webapp/wcs/sto...Preference

Pokewalker

Will definetely buy it. The reason why i play pokemon is for the "gotta catch em all" feeling so if i can't get em all there's no point on continuing playing. Thanks.

It comes with the game so unless you bought it used or something, you should already have it.

Also just saying it doesnt work with flash carts.

Also just saying it doesnt work with flash carts.

Oh crap I guess i'll just exchange online to get them...