It was started as the first console game in Pokémon series, as it was made to SNES. Alpha version was released as Super Pokémon, in 1993, by the project's (former) director Shigeru Miyamoto and Game Freak with the assistance of Intelligent Systems. Chris Senn was impressed and contacted the development team.
Not much information was found out while in development back then. Chris Senn, after co-writing and co-directing, left to direct then-Nintendo's rival Sega's Sonic Xtreme which was also cancelled.