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65 -> 80 SpDef (500 bst total)
There are a few options to boost him up:
>new defensive ability
Multi scale, filter, marvel scale (cool with rest), battle armor
>better coverage
Hes limited to rock, water, equake, and zen headbutt
More coverage moves to fight back against steel, grass, and poison types
>better utility
Good recovery is all really
>exclusive move/interaction
Water type version of head smash, hold item interactions like huntail/gorebyss
Relicanth is unique enough to warrant a good niche/gimmick like farfetchd or dunsparce. Instead his rock head head smash is outclassed by aggrons and his best competitive niche is as a yawn protector in 1v1. Other counterparts of his, like torkoal, kecleon, spinda, etc. have all found healthy competitive spots, while relicanth is kind of left behind, with usable stats and a lot of potential