Secrets - Pokemon Red, Blue and Yellow Guide - IGN

While there aren't any hidden codes in the game, there are a couple of secrets and odd glitches. Below, we list the most important ones. This page also

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Alakazam - Pokemon Red, Blue and Yellow Guide - IGN

25 Hidden Secrets Many Fans Still Haven't Found In Pokémon Red/Blue/Yellow

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Venusaur - Pokemon Red, Blue and Yellow Guide - IGN

Hitmonchan - Pokemon Red, Blue and Yellow Guide - IGN

Gengar - Pokemon Red, Blue and Yellow Guide - IGN

Venonat - Pokemon Red, Blue and Yellow Guide - IGN

Hypno - Pokemon Red, Blue and Yellow Guide - IGN

Diglett's Cave - Pokemon Red, Blue and Yellow Guide - IGN

Secret page - Pokemon Red, Blue and Yellow Guide - IGN

Pikachu - Pokemon Red, Blue and Yellow Guide - IGN