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Gourgeist was always the real headscratcher for me.
They introduced two bulky ghost/grass physical attackers that evolve the same way, are found in the same area, share an ability and have largely similar movepools.
The main difference (besides Gourgeist's size variants)? Gourgeist's access to Fire moves.
But only special ones.
While having lower Sp.Atk than Trevenant.
Even weirder, they added two more slow physical Grass/Ghost types the very next gen. Different abilities and movepools, but it's seems so weird that Gourgeist has the best special movepool but the lowest Sp.Atk of all of them.