Fast answer
Sonarbat is a good Lightning specialist when you want more lane control and repeated pressure, but it is usually a supporting piece rather than the first Lightning line to build over Voltfawn.
Where Sonarbat helps most
Sonarbat feels best when:
- your team already has a real carry
- wave pressure is the main problem
- you want more paralysis value without giving up all your damage
Evolution priority
Medium. Sonarbat is worth real attention once your core Lightning shell already exists, but it is rarely the first line that decides an account.
Verdict
Think of Sonarbat as a pressure specialist. It is most valuable when your board is already functional and just needs more control to feel clean.