Burmy is bad. Everything about Burmy is bad. But at least Burmy has a point to exist. He not only exists to show off gender-based split evolutions, but he also attempts to show off the still-painfully-underwhelming point of battling in different locations by changing his appearance and his type when evolving (if she's a girl, anyway). Do they suck? Yes. But at least I can see the reason why they're here.
...which is more than I can say about Finneon and Lumineon, possibly the worst Pokemon family ever. Being able to use Bug moves is kinda neat; Water-Bug actually makes a decent defense and a surprisingly good offense. Oh wait, what's that? Finneon's a pure-Water Pokemon and not part-Bug? And they aren't really that interesting to look at? And they suck in battle unlike other fish like Gyarados and Milotic? You say Seaking outclasses it despite being lousy, too? Well, then, why should I care if I ever see them? Oh, Lumineon can't be found in the wild during the Sinnoh campaign, and the only trainer with one is not a required battle? So I can't complete the Sinnoh Dex without her?
ಠ_ಠ