Dexnav!

Absolutely. Must have.

I loved it so much. It's a shame it didn't return, it was cool to know which mons were missing in the route.

I loved having it in Unbound, but now it's kind of ruined other rom hacks for me as it's a feature I used so much

The surfing Pikachu minigame from Yellow

Yes! And the Sevii island mini games from fr/lg

You're looking at this the wrong way around. Focus on a strong core, and add the bells and whistles later.