As a kid, I seriously thought that Lunatone and Solrock could evolve if I gave them a Moon Stone and Sun Stone respectively. I remember playing Sapphire, I had a Moon Stone and I went to Meteor Falls to catch a Lunatone just so I could evolve it. Of course my hopes were crushed when I read it couldn't.
Oh and I thought Remoraid evolved into Mantine because in one of Mantine's official art, Remoraid was on its wing.
This reminds me how I thought Eevee evolved into Espeon with a sun stone and Umbreon with a moon stone. To this day I still think that's how it should of been done.
And about the mantine thing. I thought if you caught a mantine maybe you would automatically get a remoraid because of it's sprite art!!! Back when I didn't know where to find remoraid in gsc I would catch a mantine and surf around in hopes it would attract them looooooool
(I just edited this so many times sorry tehehe)