First you need to get the key from the radio tower in goldenrod. Then in the radio tower there is a place where you need to go. Then go into the basement.Later come back to beat the boss. Good luck!
P.S. You need to get a key from the basement to open the door that leads you to the boss.[I might be wrong because I did it a long time ago. I'm not that good at remembering stuff that happened long time ago.]
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use the basement key in goldenrod city. the key is in goldenrod.
Just go around to the other entrance next to the Name Raters House :P
you get the card key for the radio tower in goldenrod by saving the director from the underground basement. Talk to him and he should give it to you.
You can find an Amulet Coin in the Goldenrod Department Store basement.
beat the goldenrod gym then go to the flower shop in goldenrod and she'll give you the squirt bottle