Shadow Exeggutor

Despite Exeggutor's loss of its place as a top Grass/Psychic attacker, Shadow Exeggutor has managed to reclaim its previous glory... kinda. Shadow Exeggutor is a solid Grass Type attacker and a usable Psychic Type attacker, though it's still outclassed in general. It's probably worth raising for newer players that need Pokemon to fill either of its types on their team, but generally not worth the investment for players who are already well off on those two fronts.

Best PvE Offensive Moveset

• Confusion should pair with Psychic for a Psychic Type attacking set.
• Bullet Seed should pair with Solar Beam for Grass Type damage.
• Seed Bomb comes out far more frequently than Solar Beam, meaning it will occasionally out-perform Solar Beam if Shadow Exeggutor drops while it has a lot of energy saved up.
• Extrasensory and Zen Headbutt* are objectively worse than Confusion.

Best PvE Defensive Moveset

• Confusion is simply the best defensive fast move in the game.
• Of the other fast moves, Extrasensory is a distant second.
• Seed Bomb is the most threatening defensive charge move, firing early and often on top of being hard to dodge.
• Psychic is a good move with relevant defensive coverage.
• Shadow Exeggutor may not survive long enough to use Solar Beam.

Confusion is an objectively great move in PVP thanks to its high damage output and good energy generation. Bullet Seed offers superior energy generation, but the lack of damage output is discouraging. 

It pairs well with Seed Bomb to pressure shields while dealing solid damage. Psychic hits hard coming off of STAB, and it can provide some shield-baiting opportunities.