From bulbapedia.bulbagarden.net:
Gyarados's name may be derived from a combination of 虐殺 gyakusatsu massacre/slaughter, and 逆境 gyakkyō, hardship/adversity. Both words relate to the creature's violent nature and the hardship it experienced before evolving. The end of Gyarados' name, ドス dosu, is a Japanese onomatopoeic word representing the piercing of flesh, once again owing to Gyarados' violent nature. Alternatively, the dos may just indicate that it's the second in its evolutionary line.
The red Gyarados is simply a shiny Gyarados. This means the red Gyarados is not any stronger or weaker than other Gyarados. Gyarados in general is considered to be a very powerful Pokemon for how easy it is to get.
Yes, the "Red Gyarados" is actually just a shiny Gyarados.
Gyarados does not evolve into Lapras.
No, Gyarados and red Gyarados are basically the same having only one key difference; red Gyarados is a "shiny" Pokemon which changes its color and makes it rare to find in normal gameplay.
another gyarados, or a magikarp of the opposite gender. (it should work, I've never tried breeding Gyarados)
The red Gyarados is simply a shiny Gyarados. This means the red Gyarados is not any stronger or weaker than other Gyarados. Gyarados in general is considered to be a very powerful Pokemon for how easy it is to get.
Red Gyarados has no advantages over regular Gyarados. Red Gyarados is a shiny Pokemon, which has a different appearance but has identical stats to regular Gyarados.
A Magikarp can evolve into a red Gyarados. The Magikarp needs to be a shiny Magikarp in order for it to evolve into a red Gyarados. This is due to the red Gyarados simply being a shiny Gyarados.
Gyarados does not evolve
Gyarados was created in 1996.
Gyarados do not evolve. Magikarp evolve into Gyarados at lvl. 20
Yes, the "Red Gyarados" is actually just a shiny Gyarados.
You treat it like a normal Gyarados!
Unfortunately Gyarados does not evolve.
Red Gyarados has no advantages over regular Gyarados. Red Gyarados is a shiny Pokemon, which has a different appearance but has identical stats to regular Gyarados.
Gyarados does not evolve into Lapras.
To get a red Gyarados in Pokemon LeafGreen you first need to catch a shiny Magikarp. This shiny Magikarp will be able to evolve into a red Gyarados. This is due to the red Gyarados simply being the shiny color of Gyarados.