When you first enter the valley, start shooting pester balls at the edge of the river in the direction of the crazed mankey. If you keep shooting at the water, a magikarp will pop out and flop towards the mankey. The mankey will then punch it and send it flying through the air. Keep going through the valley until you reach a waterfall. Look to the left and the magikarp will fall onto the ledge near you. Throw another pester ball at it and it will flop into the water towards the waterfall, where it will suddenly evolve into gyarados. That's when you take your snapshots.
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Gyarados doesn't any further on Pokemon FireRed.
Gyarados is a water type. Water type Pokemon are weak when battling a grass type Pokemon.
Yes, the "Red Gyarados" is actually just a shiny Gyarados.
No.
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.