I've always disliked Shuckle, but offering it multiple variations like you do is pure genius!
I'll give it a try for sure!
PS :
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Edit : Whoa that was the fastest demo ever.
It suffers from some downsides, as the cutoff mountain tiles near NEXTCITY, the left-as-before dialogs lines and all that was said before, but holy donkers this game will be dope once it's completed... Hmm I did not manage to beat ehhh Brock because I was not in the mood for grinding.
Oh and I've seen that you've got some inspiration for movepools available : Shockle=Pikachu (Slam), Shucloud=Swablu (Astonish).
Oh and the cries remain unchanged, I'm sure you will try an invent some Shuckle's cries variations as you did for character design.
Oh and, just personal opinion, I think that Wormckle's movepool (or Atk stat, you choose) is underpowered compared to its fellow Shuckies.
I expect from this work! =D