Grass Oath is a Grass-Type attack to be learned by Tsutarja in the upcoming game Pokemon Black and White. It is a combination attack. These attacks can be joined together if you select both attacks by selecting two or more specific attacks. Three examples of these attacks include Grass Oath, Fire Oath and Water Oath. If you use Grass Oath and Water Oath, the moves combine to make a Moor attack which lowers your opponent's speed. In addition to that, Grass Oath and Fire Oath creates a Field of Fire which will cause damage to the opponents each turn.
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