The old man in Viridian City, like in Pokemon Red, Blue, and Green, will show you how to catch Pokemon. However, in Pokemon Yellow, he will attempt to capture a Rattata rather than a Weedle, and he will fail. This was introduced as a safeguard to the famous "Old Man Glitch" in Pokemon Red, Blue, and Green wherein you could quickly clone items and find over-Level-100 Pokemon because of how the old man attempted to show you Pokemon capture. This is also why his attempt is just one-time and not repeatable as in Red, Blue, and Green.
Submitted By: KeyBlade999
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