>>56442651That's just the early bug Pokemon gimmick and it pretty much never changed, the average level was only slightly raised in modern gens.
Tarountula evolves at level 15 for instance, Spewpa at level 12.
The only times where early bugmons don't evolve very early is when their base and middle stages aren't so bad to be basically dead weights until they evolve compared to most other base and middle stages.
