Heatran. It can be found in Reversal Mountain in Black and White, and in Stark Mountain in Diamond, Pearl and Platinum.
Diamond Mountain Center was created in 2000.
The address of the Black Diamond Library is: 24707 Roberts Drive, Black Diamond, 98010 M
The address of the Black Diamond Museum is: Po Box 232, Black Diamond, WA 98010
Europe: blackAmerica: the symbol that that represent the most difficult ski runs is the black diamond
Yes, it is a black diamond representing a black diamond.
Heatran is unavailable in Gen V games, but is found in Stark Mountain post-game in Diamond/Pearl/Platinum
A black diamond won't sparkle like a white diamond, but a very special black diamond, the Amsterdam Black Diamond is apparently a visually stunning stone. Read more, below.
Triple black diamond is a marketing thing, not a standard trail designation. The double black diamonds at Schweitzer, Bogus Basin, and Sun Valley are every bit as hairy as the triple black diamonds at the resorts that have them.
The web address of the Black Diamond Museum is: http://www.blackdiamondmuseum.org
stark mountain
See the legend. There's no standard "meaning" for any color on a map, though it's pretty common that blue means water.