Aside from the h-game angle, which I have basically nothing negative to say about, this is a surprisingly robust translation of Pokemon gameplay into the Ren'Py engine, but there are still a couple nagging issues holding it back. Obviously some things aren't feasible, since this is already an ambitious project as-is, but some are, and those will be what I point out.

These are the main things that keep me from wanting to play the game without cheats; I really do want to play this game as intended, but these things just can't be overlooked, and I have to use the cheat mode to not be actively frustrated or drained while playing because of them.

Mainly, it's just the lack of exp. share. Switch training isn't fun in a normal Pokemon game, and doing it in a slower engine without button controls is significantly less fun. If you really wanted to be a purist to the earlier Pokemon games, having it be an item only one Pokemon can use would be fine, but I think the modern version that applies to the whole team is just better for this format. I'd also like for experience to be dynamic like it is in Pokemon - leveling up after beating each Pokemon rather than at the end of the battle - but I'm also not a Ren'Py expert and this could be a much harder request than I think it is, so feel free to ignore it.

Next, I think the base exp gain should be bumped up a little. I understand wanting to be faithful to the source material, but Ren'Py runs slower than even the slowest Pokemon games (because it needs to, I assume), so since making the game faster isn't an option, increasing the reward so the player still gets the same result from the same amount of time invested seems like a fair compromise. 

I also think the dating sim aspect could be ramped up a bit, but since that isn't based on anything and I'm already suggesting speeding up other parts of the game, I'm fine with that staying as is.

Other than those (somewhat significant) gripes, this is an incredibly impressive project that you should feel proud of. I'm excited to see where this goes from here. I'd give it 4.5/5 if I could.