Final Submission
50 / 75 / 40 / 80 / 65 / 59
BST: 369
This goes up 200 BST, which rivals Larvesta's gains and is not too far above a bunch of other 2 stage bugs and dragon evolutions like Swablu/Sizzlepede/Skrelp. Our little critter itself is a Dragon, so I think it having 369 BST for a baby is fine compared to the non-dragon Swablu/Skrelp. As far as pure dragon evolutions go for 2 stages, we don't have many. Noibat gains a whopping 250 BST while Tyrunt goes up only about 159. There's also Applin, but that's a gimmick first stage like Magikarp so I didn't bother considering it.
While its still mixed, I decided to make the SpA a small boost while the Atk gets a huge boost based on its movepool for the most part. This prevo learns Bug Buzz before it evolves, which is our biggest Bug type Special Attack move. As it evolves, it gains a huge boost of +60 Atk, and it learns its semi-signature Dragon Hammer as it gains a massive tail for mauling things with. That being said, it doesn't have a low Atk stat as a prevo either. Its Atk is still greater than other Atk based bugs like Sizzlepede or Skorupi, and is just under the dragon Tyrunt (which doesn't have a mixed thing going for it)
As for the defensive values, I didn't increase the defense or special defense too much since it looks sturdier than Miasmaw since its mostly just the carapace. I did decrease the health though because there isn't as much meat on it like there is on its evolution. I also dropped the speed by 30 since it looks like it can scurry around, and ~50 speed is not uncommon on prevos.