Pokemon GO : Eevee Evolution Into Flareon

This time we have a video about pokemon go game, a video that show you the evolution of Eevee into Flareon. 
I'm still confuse about this Eevee evolution, in the pokedex or pokemon index is show the phase of the evolution, in my understanding Eevee should evolve into Vaporeon first then into Jolteon before Flareon.

But, why this evolution directly into Flareon and increases 496Combat Power from 336 to 832
Anyone can explain to me?

This is the video

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