Most of these can be mix and matched to be in either city Non-Item NPCs
Man: I've seen shady people all dressed the same running around Rassic city, I wonder what they are doing.
Woman: I've always wanted to live in a castle.
Girl: A lot of strong trainers come from Rassic city and I'll be the next! (This could be a trainer outside the city who challenges the player)
Man: Have you heard of the mysterious statues in the Ancient Pass?
Woman: Baily is such calm person, it's hard to believe he trains such wild pokemon.
Girl: When I'm older I want to be as strong as Rex!
Girl: Have you seen a Grozilla up close? They are scary...
Man with a Shrubzor(if you want to make the sprite): I love my Shrubzor it resists a lot of moves but I have to be really careful around fire types.
Woman: Some pokemon have the strangest weakness. Did you know a grass and ground type is really weak to ice? What's with that?
Boy: I want to dye my hair green like Baily.
Old woman: There used to be this nice girl named Starr who lived here, I wonder what she does now.
Woman: I just moved here from Subhail City. I'll miss the beautiful snow in the morning.
Man: I heard Wade still uses his very first pokemon, it must be really strong by now.
Woman: I want to visit all the towns in Rikoto, though I haven't made it to Subhail yet. The weather isn't forgiving.
Man: I once saw a BlackMurkrow, it kept reciting random strange information.
Woman: My son won't stop playing video games.
Son:Hah! BioManiac strikes again!
Man: Sometimes I feel like a Lazloth.
Woman: I rode Himalamas around Subhail, it was really cold.
Man: Some people have never seen a Sasquash and say they are a myth, how absurd.
Item NPCs
Old Man: This Coin Case is lucky I don't have much use for it any more, here.... <Obtain Coin Case>
Old Man: I hope you win big!
Man: Hey have you seen a rock this color? <Obtain Cold Stone>
Man: I feel warmer not holding it, you keep it.
Quest NPCs
Boy: I can't catch a Bugray! If you have one would you trade for my Chrysapiller?
<Trade Bugray away to obtain Chrysapiller>
Boy: Thanks! My bug collection is getting really rare!
Man: I have a wish I really want to come true, I've heard you can wish upon a Cosmet, do you have one?
<Has a Cosmet> ... ... ... phew, all done. Now my dream will come true. For your help take this... <Obtain Star Piece> Maybe it will help you with your wish.
<Doesn't have Cosmet> I want my wish to come true...
Woman: Nawale, Nawale, swimming in route 12.. Oh I'm trying to write a song about Nawales but it's hard because I've never seen one. Do you have one?
<Has a Nawale> Oh my they are pretty big and pretty white, they could take a Polarpow in a fight... thanks for the inspiration here <Obtain TM 07> The Hail has always helped me think.
<Doesn't have Nawale> I can't wait to see one.
I'll come edit this page with more as I think of them ^__^