>>477227877 out of 8 Gens launched in three years. The only one to break the cycle was DP and after that released, they hired a fleet of new staff to better adapt to their devcycles, so much in fact, they were able to start releasing the games simultaneously world wide.
Even when they changed from Capsule Monsters to Pocket Monsters, they STILL took three years to launch the game and children still can't get the concept of the kiddy brand shitting out a new Gen every three years to refresh the name and target a fresh set of children with them.