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You know how some older mons lost a bit of charm after the transition to 3D (losing the dynamic poses from their 2D sprites, colors desaturated for some reason..) I think Gholdengo is the opposite of that. His design utilize 3D in ways that might not work if he was introduced in older gens
SV gave Pokemon models more detailed textures, steel type mons becoming metallic and shiny. Gholdengo is literally gold. His animations while following you and battling on water are also neat
To me Gimmighoul line is THE gimmick mon of this gen. You find Gimmighouls all over the map especially interesting spots like ruins and checkpoints.
While the two other mimic lines are stylized to fit the Pokemon world (Pokeball form) Gimmi's in a literal treasure chest and one of the themes of this region is 'Finding your own treasure'. This is a line involved around exploring and rewarding you for doing so.
Gimmighoul is not even a 'normal' ghost Pokemon. it's super weak so the journey to evolve it is like evolving a Magikarp to Gyarados where a weak useless mon becomes a strong mon through your hard work
For better or worse this is a very unique line. If they're the usual ghost objectmon then it'd make way more sense for it to become a bigger chest/mimic monster but they're not. They're also apparently ultimate beings and can't breed for some reason
I don't think they're based on anything deep other than the idea of collecting coins all around the region for a little dude to evolve into a stack of coins. Don't know why they made it a radical mascot surfer dude but his animations are adorable and full of personality so I really don't hate it.
He's my favorite mon from this gen. I understand why people hate it but I can also see people genuinely liking it too. He's a funny guy