>>29266377We've only had that twice: once in Generation I, the first generation, and once in Generation V, where they tried to have a game where you only encountered new Pokémon.
Generation II had 100, and it's pretty well known that likely included a few rejects from the past generation. Also, there were new members to first generation evolutionary lines as well.
Generation III got the closest with around 130, and it also tried to do what Generation V did to a lesser extent.
Generation IV only had around 100, similar to Generation II, and like in that case there were quite a few evolutions and pre-evolutions of past Pokémon. They made up quite a large portion of the Pokédex, and some were not even a part of the regional Pokédex until Pokémon Platinum came around about two years later.
Skipping over to Generation VI, there were only around 70. Mega Evolutions, new powerful forms of past Pokémon, were introduced as well, however. 28 were added upon their debut, and ORAS later brought upon 20. That's around 100 in X and Y, and nearing 120 in ORAS.
Finally, Generation VII will bring us around 80. Again, a new concept has been introduced. This time, it's Alolan/regional Forms of past Pokémon. With 18 in total, that brings the number to around 100 again.
In short, 100 with some new additions being follow-ups on past Pokémon is more common than 150 fresh new faces. While I would love to have more Pokémon (Generation V is my favorite in large part due to its risks), we have to accept reality.
