When you are in violet city go then south and then there is a man, talk to him he says it cost 1,000,000 coins, but you can't carry that amount. The max amount of coins you can carry is 999,999.
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U can get it frm mahogany town mart for 9800 coins
Slowpoke will evolve at Level 37.
Just go to Slowpoke well and save, so when you go in the game again you will enter slowpoke well.
It is just a collectors item ZERO effect.
You can't get a Raticate Tail in Pokemon Gold, Silver, or Crystal.