While Im very happy to see that you have taken such a big step towards the future of Ds rom hacking with this project I do have a bit of advice , playing through the First light platinum :
1. Add some variety to the gyms - if i remember correctly , light platinum had 4 different gym leaders / E4 members who used ground types which was a bit crazy , so i recommend doing some unique gyms instead of just gyms based on type , possibly based on pokemon with certain high stats such as an Attack gym / Special Attack gym or Def / Sp Def gyms. Maybe some Weather Based Gyms or Dual Type Gyms ?
2. Tone down the amount of Rivals while ramping up the difficulty of ones you do keep . There were a ton of rivals in light platinum and they had 2 - 3 pokemon each making them more annoying than challenging . Keep 2-3 rivals , give em 4 -6 pokes each and use the others in some other way such as gym leaders or E4 members .
3 The Story - Watch Kyogre and Groudon fight , watch Lugia and Ho oh fight , watch Dialga and Palkia fight , Watch Reshiram and Zekrom fight , go through Team Steams base with 3 stories of grunts with the same dialogue and pokemon is what i got from the story . I really don't want to go through all that with adding watch Xerenas and Yvetal fight . Refine ( not redo )the story and add some variety to the grunts while cutting down on the sheer amount of them
4 Mapping - You've made one of the biggest maps in a rom hack i 've ever seen which is quite the feat , but you couldnt fly to lots of the cities and towns due to not having enough fly points. my recommendation would be to combine a few of the cities and make it a lot easier for people playing who dont want to fly to a city and then have to travel by land / water to get another city
5 Free Pokes - If i remember correctly you got a a bunch of free pokes in the game and while it was nice it made the game too easy overall , getting a free dratini , spritomb and all the starters was a bit too much and made the game a bit less entertaining for me . so while you should have a couple of treasures for us here and there dont spoil us with a ll the freebies
Anyway those are just my opinions .thank you for making light platinum and all it has to offer not once but twice . i do hope you'll take my suggestions into consideration