Yes, any class can have a Gryphon, BUT you have to be on the alliance which means being either a Human, Dwarve, Gnome, Night Elf, or Dreanei.
You can receive training for a Gryphon at level 60 for 500 gold
all classes can have a gryphon BUT you have to be alliance (Human, Night Elf, Dwarf, Gnome, Draenai, Worgen). However I think you can get the mount Spectral Gryphon even if you're Horde
The Black Knight's mount is named the "Black Knight's Gryphon", but is called the Black War Gryphon when you are riding it for the quest. The Black Knight and his Gryphon can be found in the Argent Tournament Grounds when you are on the relevant quest, as well as the Crusader's Collesium where he is the final boss of the Trial of the Champion.
Only Death Knights can get them, and they are in acherus where you can buy them from Scourge Commander Thalanor for 950g
The gryphon is a mythical beast.
No it does not; the mount's speed does adjust with your riding skill, but its appearance does not.
There is no 'BEST' class in wow. Each class has its strengths and weaknesses and can be overcome by another player who is better.
Since gryphons are mythological they can be any color you wish them to be.
The Silver Gryphon was created in 1997.
The ISBN of The Black Gryphon is 0886776430.
The Black Gryphon was created in 1995.
The ISBN of The Gryphon's Skull is 0312872224.
Gryphon Trio was created in 1993.