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When I first played GSC as a kid, I would always end the game around the guy who sells you a Slowpoke Tail, because I thought I would need millions of dollars to get through. I try grinding money from Trainers on the Pokegear, but I always get impatient.
It took me until 2010 when I was 16 to realise that you don't need to buy a Slowpoke Tail at all.