I'm not so sure. probably shadow tag? I definitely know it can increase the power of GHOST but I'm not so sure about dark type.... but there is this cool website that I believe is THE BEST Pokemon website. it is called seribii.net. go on Google and type in "Pokemon emerald item list." you can try any website, but i believe it is the best thing ever, next to bulbipedia.com, a Pokemon Wikipedia. either one is good.
It is the earth plate you can get it at the oreburgh gate or at the underground.
the fist plate on rt. 215
Black Belt.
The earth plate which is found only underground. dont worry they are not that tough to find
You get the Silk Scarf on Pokemon Emerald in a house in Dewford Town.A Man gives it to you in there. When held by a Pokemon,the Silk Scarf raises the power of its Normal-Type Moves.
Ledean can learn the moves tackle, supersonic, baton pass, comet punch, light screen, reflect, safeguard, and hidden power.
If you want a charcoal on Pokemon Emerald Talk to the old Man inside the Herb Shop in lavaridge town. He will give the charcoal. When held by a Pokemon,the Charcoal raises the power of its Fire-Type Moves.
tm43 in emerald is secret power
The Castform that you get from the guy at the Weather Institute has a Mystic Water attached to it. When held by a Pokemon,the Mystic Water raises the power of its Water-Type moves.
There is a 5% chance a Wild Abra will be holding a Twistedspoon.The first Abra I ever caught had a Twistedspoon attached to him. When held by a Pokemon,the Twistedspoon raises the power of its Psychic Type Moves.
No such thing exists.
the TM 10 in emerald is hidden power. te attack power varies among different Pokemon. accuracy:100 pp:15