MidnightFennekin
Furfrou Fanatic
It has the same amount of weaknesses as pure Grass type. Two of Grass's weaknesses are neutralized by the Ghost type, but Ghost doesn't lose any weaknesses, so it still retains its five weaknesses.
But it gains two immunities and five things it's STAB SE on, so it balances out.
Are you for or against it? I'm too lazy to read the last few pages.