If you're asking about the leadoff skill, it's active in all modes, at all times, so long as he's slotted in the leadoff spot(vs' left and vs' right). The exception is WoH where it'll only be active for the first Ab, 10th Ab, 19th AB, etc, etc.
If you're asking about first pitch, it's active in all modes, at all times, except EB/CVC.
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– The Great Houmy
If you're asking about first pitch, it's active in all modes, at all times, except EB/CVC.