>>41535225-They shouldn't have switched its special stats with its physical stats. Outside of Earthquake its best STAB moves and its best coverage moves are all special.
-They should have given it a selection of abilities. Mimicry is detrimental in most cases, and Stunfisk can neither set its own terrain or use any moves that take advantage of terrain.
As far as I see it, there are a few pros though:
-Ground/Steel is an excellent typing - when your opponent isn't changing your type with max moves.
-As it stands, Stunfisk is the bulkiest of the Ground/Steel crowd in Special Defense. Though it would have been even better if its stats had not been modified. Like old Stunfisk however it still has no access to reliable recovery.
-Thanks to Mimicry, Stunfisk might have a place on mono-Ground teams to counter HA Rillaboom or other setters of Grassy Terrain, because it becomes the sole "Ground" type to resist Grass when its typing changes.
That's my analysis.