Ayy i remember this game! Used to play it alot a few years back xD, last i remember they had all the regions up to gen 4, and cool event pokemon (halloween, valantines etc). My favorite part was the mounts and the MMO aspect. You could buy and sell pokemons, items, mounts and so much more!
Might go back and try it again, though i think i forgot my account already haha
Yeah, my boyfriend told me a little bit about how it was, at first it was only two regions but they were adding more, I understand that now it's up to 5 gen. I love the MMO aspect and the fact that I can buy and even sell pokemon (usually rare pokemon) seems interesting to me, as well as buying items, objects to move around the maps, and things like that. I really love it, I understand why it was so popular at the time hahaha.
You could recover your old account and try the game nowadays, I hope you can, it's worth it!