Is Stealth Rock as big in this Gen as it was last Gen? "Cause if it is, then I have reason to worry about bringing Flareon in.
Although the fifth generation's addition of Priority Taunt and Magic Bounce helps prevent it, Stealth Rock is still the best move in the game and is common amongst most teams.
To add onto what Hux says, I find it more common among SandStorm and Stall teams.