>>25054593Gen 1:
Efficiency in-game: Water>Grass=Fire
Gen 2:
Efficiency in-game: Water>Fire>Grass
Gen 3:
RSE
Efficiency in-game: Water>Fire>Grass
FRLG
Efficiency in-game: Water>Fire>Grass
Gen 4:
DPP
Efficiency in-game: Fire>Grass>Water
HGSS
Efficiency in-game: Water>Fire>Grass
Gen 5:
BW
Efficiency in-game: Fire>Water>Grass
BW2
Efficiency in-game: Water>Fire>Grass
Not that it matters, this particular game is so generous with great early-game mons that dropping your starter might actually be the best move.
Gen 6:
Efficiency in-game: Fire>Water>Grass
It kinda sucks for Fennekin that Mega-Zard is so powerful and makes it a good choice to drop it. Froakie is second best of the Kalos starters and doesn't get nearly as badly outdone by the Mega-Kanto starter of it's type.