Although English is not my native language I wrote a few lines, I hope it's something useful:
ROUTE 16 -
Pokemon Ranger Felicia - "You will not get through here without first battle with me!" (After battle) "Now you can already go your way"
CRYSTAL CAVE -
Middle Age Man - "If you like crystals you are in the right place, here you will find crystals of all sizes, shapes and colors"
Black Belt Joshy - "Fists are nothing if you do not know the true art of fighting!" (After battle) "Now I see, I need to improve my art"
Pokemon Trainer Lucy - "My (Pokemon) like the energy emanating from the crystals of this cave, but like even more a good fight!" (After battle) "Today the energies were not favorable for my Pokemon..."
SNOWPEAK TOWN -
Middle Age Woman - "If your mother were here would tell you to dress warmly, then just wear a coat to not catch cold!"
Old Man - "Did you know that some Pokemons have wool? As Pokemons are our best friends we can use the wool of them to do wool jackets, then we endure the harsh cold of the mountain"
FROSTHAIL FOREST -
Young Boy - "Hello! I invite you to come back in this forest in the summer, you will see that the trees back to life"
SUBHAIL ICECAPS -
Pokemon Trainer Boris - "My ice Pokemons learned new skills, I'll show to you in the battle!" (After battle) "My Pokemon learn even stronger skills, I have no doubt..."
VICTORY ISLAND -
Poke Maniac June - "You know nothing about Pokemons! I'll teach you a lesson child!" (After battle) "You know more than I thought, despite being young"
Pokemon Trainer Rob - "Being good is not enough, you have to be the best! Ready to prove that you are better than me?" (After battle) "Ok, you are better than me"
RIKOTO LEAGUE VILLAGE -
Young Boy - "Do not bother me, if you want a battle you have to schedule for later..."
Young Boy - "It makes no sense... I never lose a Pokemon battle before! How can there be so many better trainers than me in this village!?"
Poke Maniac Willow - "My (Pokemon) is a very rare species of Pokemon, I'll show to you all his strength in a battle!" (After battle) "Even after this defeat my (Pokemon) remains the best of all Pokemons!"
Pokemon Trainer Albert "You find yourself a great Pokemon trainer? Then defeat me!" (After battle) "I see that you deserved this victory, have a nice day"