Pokemon Plus Nobunaga's Ambition could have been Dynasty Warriors: Pokemon

The newest Pokemon title will combine Nintendo's popular catch-em-all creatures with the Japanese historical setting of Nobunaga's Ambition, but it turns out that wasn't the first choice of historical periods. Originally, according to the latest Famitsu, the spinoff was going to combine Pokemon with the very popular Tecmo Koei Dynasty Warriors series and its historical setting, which is instead based on the Three Kingdoms period in Chinese history.

Nintendo felt the Dynasty Warriors series was a little too violent to be matched up with its cute little creatures, however, and so Tecmo Koei pitched the series known more for strategy than action, which Nintendo eventually agreed with. Famitsu also says that though both companies are working on the game, Tecmo Koei is heading up day-to-day development during production.