>>15693852small sized gourgeist is a better sub seeder than trev because of its speed
Large sized gourgeist is a better tank.
And gourgiest also makes a great trick room suicide lead with explosion.
Also Gourgeist learns fireblast whick can take out a ferrothorn in two hits even with no sp att investment
AND gourgeist can learn shadowsneak
Trev is best at bulky physical though.