The Dread Plate and Blackglasses strengthen Dark-type moves. You can find a pair of Blackglasses in a house in north-western Celestic Town. Talk to the guy on the right.
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Charcoal is an held item. It boosts the power of FIRE-type moves.
There is an item called the charcol in soul silver and heart gold, though i am not sure about the other versions, though you may be able to get it in them. hope this helped! Dizzywizz
Boosts Psychic-type moves by 20%.
Boosts the power of grass type moves.
It boosts the power of grass-type moves