How do you get a jynx in Pokemon Yellow?

The following Pokemon in Pokemon yellow cannot be caught, Weedle, Kakuna, Beedrill, Ekans, Arbok, Meowth, Persain, Koffing, Weezing, Jynx, Electabuzz, and Magmar. You will need to trade from red or blue and to get the jynx's from red and blue you'll need to trade a polywhirl for a jynx in cerulean city.