Interestingly, a battle in the game is left in the raw code for Pokemon Red, Blue, Green, and Yellow in which the player battles Professor Oak. This battle has Oak with very powerful Pokemon, even stronger than the Elite Four's and the Champion's, indicating he was likely to be battled after winning the game. This battle is accessible through the use of hacking and certain glitches, but is otherwise not available to the player.
Submitted By: KeyBlade999
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