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Question & Answers
Answer from: portallulu
It's in the chapter called rumbletown. When you get to the part called Bridge Belly Dumps and Sour Sink Lodge. The Soul Gem is inside (also a 2nd key) Sour Sink Lodge.
Answer from: NiceGuy1
To be more descriptive than just using area names. On Chapter 3: Rumbletown, after you get a fight against mostly archers in a circular area, you get on a bridge and have a cut-scene with Brock where he destroys the bridge and drops you into the area below. In this area, after a few block puzzles, you get a key. The obvious thing to do is to use the key on a door here, but don't. Next to the door is a house. Walk into the house - Soul Sink Lodge, according to portallulu - for ANOTHER place to use the key (there's a replacement key behind this door, don't worry), as well as Hot Dog's Soul Gem.