Gens 1-2: The Original Triology
>Acquire a huge fanbase from a simple but lovable premise and become international pop-culture monoliths
>After growing up a little all the original fans lose interest and move on to the next fads, leaving a smaller dedicated fanbase behind
Gens 3-5: The Prequel Trilogy
>The franchise keeps developing but, despite adding to the series immensely through constant innovation, is constantly rejected and derided by the original fans (who don't even partake in the franchise anymore) for being too different to their childhood
>This period also sees the rise in a huge amount of side material and spin-offs to entich the world
Gens 6+: The Sequel Trilogy
>After a while, the property has a huge resurgance in hype (The Force Awakens and Pokemon Go) that gets the attention of all the original fans again, massively boosting popularity once more
>The franchise then devolves into mindless pandering to these people who eat it up, who, having missed the age of maximum quality, have no idea what a good installment actually looks like
>This pisses off all the dedicated fans who see the decline in quality, but they are at odds with hordes of normalfags, twitter personalities and critics so they are ignored