Here's what I can tell you:
* There are no Pokemon in Pokemon Crystal called "Goldenrod" or "Lavender".
* Power Plants are a type of facility that produces electricity. You might be thinking of a specific location in the game, but it's not clear which one.
To help me understand your question better, please tell me:
* What are you trying to find in the game? A specific Pokemon? A location? An item?
* What is your goal? Are you trying to find a particular Pokemon for your team? Are you looking for a way to power up your Pokemon?
Once I have more information, I can help you find the information you're looking for in Pokemon Crystal.