In Cerulean City, you stopped by some sort of house that had a man and his wife in there...seems like the said man had a trade offer for you!

Man: Ah! You! Greetings, the name is Dontae, I was wondering if you wanted to trade a Poliwhirl for my Jynx! Perhaps it might be of some use to you! He smiles.

Seems like he had a nice offer, I mean...a Water type for an Ice/Psychic type? Seems good to me.

After agreeing to his offer, a Trade between you and the man had occurred, so now...you have a Jynx in your team! Hooray! Please make sure to take care of her!

Now, by taking your leave...your Jynx seems to be getting used to you.

Jynx...Jynx? She seems to be curious about you...you two have technically just met.

Well, look at that, you now have a new partner in your team. Hope she serves ya well!

Jynnnnnnx... It goes for a hip wiggle! Communicating to you.

Looks like she's quite the communicator...somehow.