Gourgeist - Super Size

Pumpkin soup, anyone?

Best PvE Offensive Moveset

• Hex pairs with Shadow Ball to fulfill a Ghost-type attacker role.
• Razor Leaf pairs with Seed Bomb to fulfill a Grass-type attacker role.
• Foul Play is a downgrade due to lacking STAB.
• Fire Blast has no use. 

Best PvE Defensive Moveset

• Razor Leaf is a good choice for defense against opponents using Dark-type attackers like Tyranitar.
• Hex is just as good on defense due to its high energy delta, enabling it to spam its Charge Moves more often.
• Seed Bomb can be used frequently on defense as a 3-bar move, making it ideal. 
• Foul Play balances damage output and dodgability, and is decent overall. 
• Shadow Ball hits hard but is easier to dodge. 
• Fire Blast takes that one step further, which it less optimal for defense. 

Hex primarily focuses on high energy generation to make use of Charge Moves more frequently, while Razor Leaf is the polar opposite and emphasizes high Grass-type damage output rather than energy gains. Either can be chosen. 

Seed Bomb is useful for its lesser energy cost, making it useful for baiting shields, while also providing valuable Grass-type coverage. Shadow Ball hits hard with STAB, and is largely unresisted across the overall meta. Foul Play costs a more moderate amount of energy, but lacking STAB is discouraging when considering the similar coverage. Fire Blast demands too much energy to be used consistently, but can surprise and potentially OHKO unexpecting opponents.