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I think that Gardenia's ingame comment is more in line with what you think than foreshadowing. Aside from Mow Rotom, we only got a Grass/Ghost Pkmn in Kalos with the Pumpkaboo and Phantump lines, which are two generations after that reference.
Mow Rotom isn't Grass/Ghost, it's Electric/Grass. Pumpkaboo and Phantump were the first Grass/Ghost types.