This one is very hard to find. It is in the second part of Stark Mountain, the one that has all the trainers in it. You have to go the the left first, then go up a bit, then go down the wall. There is a small, elevated walkway, only wide enough for one person. You must get on top of it, then use the dowsing machine on you Poketch, next to the wall on the left side. You will see a VERY tiny dot appearing on the screen, because the Flame Plate is IN the wall. You just walk up to the wall and press A.
PS: this sounds difficult, but just try it. It's a lot easier to just do it.
IF YOU HAVE ARCEUS, GO TO OBUERG MINE AND TALK TO THE HIKER AND HE WILL GIVE YOU IT!! :-)
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You will need to have Arceus to hold a Flame Plate and its Multitype ability will change its type to Fire. You can obtain the Flame Plate in Stark Mountain in Pokemon Diamond, Pearl, and Platinum. Alternatively, you acquire a Flame Plate by showing a hiker in Oreburgh Mine an Arceus in Pokemon Platinum only.
Underground!
a fist plate
purple
you have to dig it up when you are underground