BS importing is simply as pie considering that the books can be found on Ebay in english for reasonable prices including shipping. Saying it's too much of a hassle is just an excuse to be lazy and get something for nothing undeservidly.
Pokemon Adventures on Ebay
I abosultely hate it when people read manga online and then don't buy copies of story's they like becuse it's just as bad if not worse then as piriting video games.
Don't get me wrong, I'm not saying fanscans are bad since I read ahead on stuff like Naruto myself since I don't want to wait years to read the next chapter, the difference being I have a subscription to the north american shonen jump so I'm supporting the author for his work rather then being just a leach.
As for chapters that's how each sagment of the story is divided by.
Books 1-3 are the first chapter aka the Red/Green/Blue Saga.
Books 4-7 is the second chapter aka the Yellow saga.
Books 8-14(first part) are the third chapter aka the Gold/Silver/Crystal saga.
Books 14(second part)-22(first part) are the forth chapter the aka Ruby/Sappire Saga
Books 22(second part)-26(first part) are the fifth chapter aka the Fire red/leaf green saga
And Books 26(second part) and everything else so far is the sixth chapter or the emerald saga and presumably once that's done the next books that fallow will be the seventh chapter or the dimond/pearl saga.
The scans only go to volume 10 so you'd be missing out on the some of the best parts of the manga anyhow by not importing it.