>>46763984Seconding this. Prism, despite its flaws, is probably the most fun I've had with any Pokemon game in a long time. The creator does a remarkable job of capturing the feel of early generations.
Polished Crystal is probably my favorite of the hacks that just alter existing titles. And by now, there are enough new additions that I still felt the sense of discovery that I did playing Gen 2 the first time around. I can't really think of anything that feels "out of place", either, except for the Gen 4 evos/pre-evos added in.