Will exeggutor get its buff!?
Do you think they will apply main game's gen VII buffs to basestats before they launch gen 3 in PoGo!? There's 12 gen 1 & 2 monsters waiting to get their buff.
Answers
Gen VII Exeggutor (Alolan Exeggutor) is a Grass/Dragon type and got a +10 buff in Attack but a -10 nerf in speed.
If/when Go ever gets to Gen 7, I would imagine it will be introduced as a net new mon. Both can coexist in Sun/Moon (gen VII), if you get a Grass/Psychic (original) Exeggutor from a trade or import it from an older game.
Now, if the OP is talking about a buff to the original Grass/Psychic egg between gens 1 and 6, I don't know.
https://pokemondb.net/pokedex/exeggutor
Aside from the Aloan forms, some older pokemon got stat buffs in generation 7 to balance with power creep of later generations.
https://www.serebii.net/sunmoon/updatedstats.shtml
Exeggutor's special defense changed from 65 to 75.
Pokemon Go is currently using data, including base stats and available moves, from the generation 6 games. (Pokemon Go released before Sun and Moon.)