It's one of the few evolutions that are related THEMATICALLY.
You were right about the gun to cannon thing; both are projectile-based weaponry. And what this dude said
>>34286815; both remoras and octopuses have suckers. Heck, they both have the elusive Suction Cups as an ability!
Also, what this dude said
>>34287034Why did they not give the REMORA Pokemon a distinct sucker??? How's it gonna stick to Mantine with no sucker??????
Another Pokemon family related thematically is the Clamperl family. Clams are completely unrelated to pelican eel/viperfish hybrids and snipe eel/chimaera hybrids, but they all share the theme of being abyssal and living in the deep ocean.
Thematic relations are a cool idea for evolutions, and I kinda wish more Pokemon families were like this. I also kinda wish gyms and gym leaders used thematic relations rather than Pokemon typing. Imagine how cool that would be!
