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How does STAB work when calculating the base power of a move under an ability, terrain, weather conidtion, or base power boosting item? For example, if a Tapu Lele uses psychic under psychic terrain, is the based power of that psychic be 180 BP which is twice as much(since it had two 50% boosts) or is it a 50% boost from STAB, then a 50% boost of the already boosted psychic from the terrain, making it a 202.5 BP move?
Also how does life orb and sheer force play into this?