"What game has had the biggest impact on the franchise as far as game mechanics that have stuck throughout the series?"

In my personal opinion I think Silver and Gold win. They added the day night cycle, pokemon that could only be caught during specific times, people that show up on specific days, shiny pokemon, new style pokeballs, and I am sure there are more. These games were definitely a good turning point in the franchises history. via /r/pokemon https://ift.tt/AxGbewW