Works perfectly because you have Water beating Fire, Fire beating Grass, Grass beating Water, and then Dark beating Psychic, Psychic beating Fighting and Fighting beating Dark.
Grass/Rock upsets the balance.
Would be the first time they used an actual immunity in the lineup though. Grass/Steel would have been more consistent as far as balanced resistances.
Nuh uh. You're setting up a reverse triangle (Psychic beats Fighting, Fighting beats Steel), but not only does Grass/Steel have no STAB advantages over Fire/Psychic, you don't even get the benefit of Fire/Psychic having a double weakness to abuse like Torterra did.
Besides, you're complaining that GRASS!!!/Dark has an immunity to a STAB of FIRE!!!/Psychic. oh no whatever will fennekin do how will fennekin ever be able to hit GRASS!!!/dark chespin when chespin is immune to psychic oh poor fennekin.
Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere