F*ck this thing, this son of a- *Technical difficulties. Please stand by...* So my boss is telling me to keep it professional. ...You know that poor, poor kid who thinks the pidove that I gave him is gonna be a staraptor? I was once that kid. Well, not as stupid considering they're nowhere near each other in the dex and people told him that's not whats happening. But anyway a time ago, before I used the internet for help with games, a dark time. I wasted a pokeball, I mean caught a dunsparce. I looked at my dex, saw the tail and then it all went wrong. The next mon in the dex gligar... "Meh, that tail looks kinda scorpion like, and it has wings. It must evolve into gligar." Raises dunspace to lever 32 before realizing. "This... thing. It's garbage. I can't withdraw anymore pokemon but this creature is an empty slot."
In conclusion, the most useful thing a dunsparce ever did was get traded to some unfortunate scientist for a tyrogue.