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>Abilities
>Natures
>Contests
>Double/tag battles
>Overworld weather
>Battle frontier that still has yet to be topped
>Secret bases
>Berry overhaul
>PC storage overhaul
Then we have Hoenn itself, which is among the best regions. There's cozy towns like Dewford and Verdanturf, nice cities like Rustboro and Lilycove, and finally awesome cities like Fortree and Sootopolis. Then there's the routes, which are pretty diverse. You got your standard grassy routes as well as a desert route, a route covered in volcanic ash and a few rainy routes with thick overgrown grass. Let's not forget about the crazy shit like M. Pyre, the abandoned ship or the sky pillar. And you'll find indents in the rocks or trees all over the place where you can put your secret base. I was really dissapointed in the following generations for having less varied and fun places. Also something interesting to know; isn't a single route checkpoint in the region, giving it an open, adventurous feeling that no other region has.
All in all, Gen 3 is pretty good. Though it does have big flaws, no day/night cycle and almost no timed events. Lot's of water/underwater routes with super high random encounter rates yet no diversity in Pokemon; and the worst is the inability to transfer Pokemon from RBY/GSC. All this could be fixed in a remake; and with all the new features introduced in the last 3 generations will be integrated. And they can use spot/street pass for secret bases and shit.