Pokemon red / blue - $30/151 = 5 Pokemon/dollar
Pokemon gold / silver - $30/251 = 8 Pokemon/dollar
Pokemon ruby / sapphire - $35/386 = 11 Pokemon/dollar
Pokemon diamond / pearl - $40/493 = 12 Pokemon/dollar
Pokemon black / white - $40/649 = 16 Pokemon/dollar
Pokemon x / y - $40/721 = 18 Pokemon/dollar
Pokemon sun / moon - $40/809 = 20 Pokemon/dollar
Pokemon sword / shield - $60+$20/400 = 5 Pokemon/dollar