Pokemon Games For Sale Question About Pokemon Versions/games?

Question about Pokemon versions/games? - pokemon games for sale

So I'll have a version of Pokemon on eBay, not really sure what I want to buy, but red / blue / yellow or more. If I have the money or gold, but with all these people who say that the game keeps his guard or to keep their savings? Some games on eBay say "SAVE works" in the title, but if she says I should be aware that the Bank can work?

Really confused, thank you