Inspired by the Bronzor/Bronzong thread, I'm just curious what people think about this species. What do you like or not like, how useful has it been to you, anything really!
Personally, I like to imagine Tentacool as having a sort of neat non-canon ability related to the red orbs on their head. I think they absorb sunlight into them during the day and then glow red at night, so you can look off the shore and see big colonies of glowing red orbs in the ocean. The ability also helps the pokemon to explore dark caves at the bottom of the ocean that others cannot see in.
I also think that because of this, they are the only aquatic species that Kyogre will not attack and kill for food, because he sees their red light as a tribute to himself (who also glows red).