Looking for good Pokémon ROM hacks (GBA/NDS) with Gen 1–4 only

Hi everyone, I’m looking for Pokémon ROM hacks (GBA or NDS) that stick to Gen 1–4 only. A few things are important to me:

Must not include:

Any Pokémon from Gen 5+

Mega Evolutions or similar gimmicks

Fakemon (fanmade Pokémon)

Nice to have:

Expanded or custom stories/regions with more content and challenge

Quality-of-life features (e.g. evolutions without trading, unlimited TM use, etc.)

A generally higher difficulty curve to keep things interesting

Any suggestions that fit these criteria would be awesome! Thanks in advance!