9 Scrapped Bosses Used In Other Video Games
1. Pokémon Red & Blue's Professor Battle - Pokémon Sun & Moon
The legend of Pokémon Red and Blue's scrapped Professor Oak boss battle is so widespread that even the most casual Pokémon fans might well be aware of it.
It was eventually discovered within Red and Blue's game data that there existed a trainer battle with Professor Oak, and per his ludicrously high stats it was most likely intended to be a bonus boss fight right at the end of the game.
Players have managed to access the battle using glitches or cheat devices, and though developer Game Freak removed the fight for reasons unknown, they ended up re-using the concept for Pokémon Sun and Moon a whole 20 years later.
In Sun and Moon, the final battle of the Pokemon League is a similarly surprising showdown against Professor Kukui that adheres to most of the gameplay parameters from the proposed Oak fight (namely, being pretty damn difficult).