What is evil toy in this game and how do we defeat him?

"Evil Toys" are the rogue toys wandering around the battlefield. You can't simply attack aimlessly in the battlefield as higher tiered evil toys require you to beat the lower leveled toys of the same kind. Some toys also require "rally-attacks" like the "Fanatic-General". Nonetheless, to beat these toys, you can simply attack them multiple times (usually five times for the entry level toys). Take note that you need officers to lead the troops that would march towards the targeted toy. Apart from that, you also need stamina to perform an attack. Usually, you need 20 stamina per attack, and you will always have 100 to start with. These are like movement penalty points which regenerates by itself overtime (otherwise you can you special items to refill your stamina). Hope this helps!