If you mean a Shiny Geodude, they appear randomly and very rarely and there's no specific way to get it.
No, Geodude cannot be blue at all. If yours is actually of this color, your game is probably glitched. If it was a shiny, it would be colored gold, not blue.
Oddly enough, Colorado means red in Spanish.
What you have encountered is a shiny Geodude, which, as you described, is gold and a normal Geodude is a light gray color. Think of shiny Geodude as a gold nugget and a normal Geodude has a regular rock.
Geodude will evolve into Graveler.
No, Geodude is not a real creature. Geodude is a fictional character only in the Pokemon franchise.
A gold geodude is just a shiny geodude you must keep finding geodude in granite cave until its shiny.
geodude evolves at lvl 25.
A female Geodude can be found randomly in the wild. A Geodude has a 50% chance of being female.
There are three Pokemon in the Geodude evolutionary line - Geodude, Graveler, and Golem. Geodude evolves to Graveler at level 25, and Graveler evolves to Goiem by being traded.
geodude learns rockthrow at lv. 11
Geodude evolves at lv. 25.
Geodude evolves into Graveler, starting at level 25.