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I caught my first Chansey today. I've actually seen it like 4 times before in my sightings but this was the first time I had time to actually look for it.
I was playing Pokemon Yellow and I had a half health pikachu, a half-health bulbasaur, and a quarter health geodude. My team is relatively underleveled and I'm in mt. moon. I've already used all my heal items. The final battle with Jessie and James takes out pikachu, bulbasaur and puts geodude...
I caught my first Gastly, Haunter, Drowzee, and Hypno. Just learned that what I thought was the Weezing silhouette was actually Gastly.
I also hatched 3 2k eggs. 2 Rattatas and a Pidgey.
I also finished my ground badge with all the Cubones.
If you already have a pidgeot or 50 candies and a pidgeotto, don't bother. Evolved pokemon are just ball bait. I pretend raticates don't exist because they are never worth it.