The effect of “Dekoichi the Battlechanted Locomotive” will include any of resolyour opponent’s “Bokoichi the Freightening Car” that you control on your side of the field.
The number of “Bokoichi the Freightening Car” on your side of the field is counted when this card’s effectves. That means if it is flipped, and the opponent chains “Ring of Destruction” to destroy the only “Bokoichi the Freightening Car” on your side of the field, you only draw 1 card.