| 51 | Blastoise | 3.10057% | 193862 | 3.415% | 156613 | 3.464% |
| 52 | Gardevoir | 3.07436% | 206153 | 3.632% | 155719 | 3.445% |
...
| 59 | Medicham | 2.90186% | 159909 | 2.817% | 125895 | 2.785% |
Blastoise and Gardevoir are just barely under OU. Mega Lucario is hogging up a ton of usage, once he's banned I'm definitely thinking Gardevoir will go up. But I don't actually think Blastoise will. Teams that use Lucario are offense-orientated, and Blastoise isn't fast enough and doesn't hit hard enough. And defensive teams will be using Vensuaur (aka WHY WON'T YOU FUCKING DIE) or Scizor. The lack of recovery, even Lefties, really limits Blastoise's allure for a defensive player. It totally could rise though: Lucario really does have a ton of usage, and Blastoise is #51 in OU.
Most offensive players will definitely go for other currently OU megas, e.g. Pinsir, Charizards, Mawile, T-Tar, Gyarados... but I think a decent enough portion will go for Medicham, Gardevoir or others. Lucario is just too good, the gap in power between it and other OU megas is a lot bigger than the gap between OU megas and current UU megas. Viability wise, there's just no reason to run UU megas over Lucario, but an argument can be made to run them over some of the other OU megas.