Very cool game! I can't wait for future updates.
I'm also working on making a Pokemon style H game, but in Unity. As a fellow game dev, here's a few bugs I found and some tips. I hope they help!
Bugs:
1. Nurse Joy's sprite disappears when healing pokemon in Eros Town.
2. You can't talk to the waiter in the resturant in Eros town unless you go behind the counter.
3. The stove top in the resturant in Eros town has no collision.
4. The title card when entering Eros town says that the town is called Erasmus town. The signboard says Eros town
5. When going south from Eros town toward Route 1, the door on the cottage doesn't load until you pass into Route 1.
6. Not sure if this is a bug, but in the starting building, going through doors one way plays an animation and the otherway does a fade cut.
Tips:
1. The first battle is very difficult if people didn't find the items in the first room. Maybe instead of having the items in the PC introduce the player to using items in battle as a strategy by having the Rival give you the potions and telling you to use them in the battle. If they still lose the battle, have the rival give them a hint that items are very useful in battle. This will help players who have never played pokemon or ones who did but didn't use items learn how to play this more competitive style of pokemon battles.
2. It's not super clear what items are interactable or not. For example the leftovers in the starting room are super valuable for the first fight, but it's not super clear that you can pick them up. I also noticed that the sprite for the leftovers was used later on in the game in another house, but couldn't be interacted with this time. I'd try to make interactable items clear that you can interact with them. This can be done by making all interactable the same sprite (the pokeball sprite) or by adding a little shine effect that plays every so often ontop of the sprite.
3. The main character's hair is a different resolution from the rest of his sprite. The same goes for the professor. It might be better to try and stick to a single resolution for sprite work. It makes the characters that don't stick to that resolution feel out of place. This also applies to the pokemon sprites, which look awesome btw.
4. The side quest for the Lopunny scenes should be pretty front and center if you want the game to be a Hentai game. It's pretty easy to miss if you aren't exploring. I'd recommend having a dialog pop-up when you pass near the cave saying that you hear growling and a cry for help coming from the cave. Then when you save the Buneary she should run out of the cave and lead you to the area you can interact with her, instead of the player having to know where it is.
5. I'd try to implement some casual H content while playing the game normally. Like animations when attacking that show a pair of boobs, more trainer sprites that have little clothes on like the Gym leader, or finding another trainer and their pokemon doing the deed behind a tree. Most people looking for a game like this are expecting H content front and center. If you have to hunt for it, you'll lose a large portion of your audience before you even have it. These small little bits of H content will keep your players playing till they can get the good H scenes of the game.
6. It'd be nice to have a way for the player to earn money outside of trainer battles. Due to the higher difficulty, if you lose a few too many times even with using items, you won't have enough money to continue playing. While this is mostly an edge case as most players aren't that bad, it'd be a nice feature. As a plus it would also help those who don't want to grind, b/c they can just make some money and use items to win battles instead of training the pokemon up.