I'd like to take this opportunity to say that I think Mt. Silver looks very nice. All the NPC:s that have different things to say and give hints on how to continue the quest makes the place seem alive. Also the mountanside map where Adenas lab is located is well designed. Good job.
EDIT: By the way, now that Slowking is being added, maybe it's a good time to look at the movesets of Slowbro and Slowking. I'd really like to see a higher power water move on them, and perhaps also a good physical move. Since they're so slow I think that they can be buffed quite a lot and still not become a serious threat in battles. Any pokemon with a dark type physical move would still be a hard counter against Slowking and any grass pokemon would work against Slowbro. With speed being the most important stat it would be nice to see the slowest pokes in the game buffed to a useable level (like some pokemon have been already, for example Golem which has a very good moveset).