It's very rare to see high usage as an indicator of the strength of a particularly problematic Pokemon. Even some of the most oppressive threats in the game's history have had pretty low usage, the thing about usage is it mostly indicates the splashability of a Pokemon IE in how many teams this Pokemon can function properly. And this segways perfectly into Lucario, Vacuum Wave Lucario is by no means a weak Pokemon, with proper support it's a fairly strong pick, but it's sadly not a very splashab