OK so I pulled out my copy of diamond (one that was coming off an ancient scramble challenge so i get to see all the "first time" dialog), because I actually wanted to see how much of this dialog was changed. Very possible the "trainers" thing was there before, right?
And...mmm, well.
guy at the gate, the first time you talk to him is this
"This is where top-notch Trainers come to demonstrate their Pokemon-catching techniques to their peers." (thene recognizes you and everyone's excited to see a catching show)
And here he says: It’s also where top-notch Trainers gather from many different regions. You might say Ramanas roses attract those who are strong—now that’s what I call flower power!
Meanwhile, the boy
People come here nto only to see the Catching Show. We get to see rare & exotic Pokemon on top of the catches. The excitement gets me all jacked up!
is now
"The smell of Ramanas roses isn't the only selling point here--The people & Pokemon drawn from all over are spectacles in & of themselves, and those intriguing, enigmatic caves fill me with excitement!"
Like you could probably write this off as just weird edits but I dunno it's just...off to me. Like there was definitely meant to be more going on. The caves are distinctly mentioned separately from the roses and the general draw of the park. Also it's not like they weren't open to entirely new dialog, the father, daughter, guy who used to track score and woman excited to see the shows on the botto mfloor are all very different dialog.
We know that Ramanas wasnt ready for primetime to begin with...I'm really thinking plans were a lot more elaborate but when it became clear they couldn't finish it, they just pulled back and focused on the main draw (the Pokemon). Perhaps leader rematches & some wild encounters were planned for here, but they shuttled those off to the gyms so they could be accesseed by anyone who couldn't get the update while the underground continued to be the primary spot to get various Pokemon. The "trainers from all over" talk (Oak also mentions that and it's not present at all in his DP dialog) would still be a little odd considering the circumstances, but the sinnoh leaders would be a good fit for here with their new Pokemon, for example.