This topic is not the ideal place for a comparison of uber usage statistics, but devoting a new topic for them is unnecessary. I'm posting them here instead.
Note: Some relatively common pokemon fall below the 14 mark, so I have extended the list, arbitrarily, to include the top 20.
Comparison of changes in weighted usage statistics from May to June
1. Kyogre (3841535 points) (=)
2. Groudon (2812595 points) (=)
3. Darkrai (2537247 points) (=)
4. Deoxys-A (1956766 points) (+5)
5. Dialga (1852690 points) (=)
6. Rayquaza (1842061 points) (-2)
7. Palkia (1677416 points) (-1)
8. Latias (1379766 points) (-1)
9. Giratina (1285112 points) (+4)
10. Mewtwo (1249396 points) (=)
11. Latios (1195636 points) (+3)
12. Blissey (1073133 points) (-4)
13. Jirachi (1017555 points) (+3)
14. Lugia (977787 points) (-3)
--- "OU" cutoff
15. Scizor (898922 points) (+6)
16. Mew (781900 points) (-1)
17. Metagross (535527 points) (-5)
18. Forretress (521478 points) (+1)
19. Ho-oh (458784 points) (+4)
20. Shedinja (380101 points) (-2)
Since people are interested: Tyranitar (233746 points) has dropped 6 spots this month, fom #17 to #23 and Garchomp (136820 points) has dropped 3 spots, from #29 to #32.
Changes in Leads from May to June
There were few significant changes in leads from May to June, so I won't provide a list, but there were some highlights. Kyogre (1110), Darkrai (1099), and Deoxys-A (792) continue firmly holding on to the top three spots. However, the number of uses for lead Darkrai and Deoxys-A largely remain the same while those for Kyogre, on the other hand, have dropped by over 500 uses since last month. Dialga (378) has risen from #7 to #4, beating out Groudon by nearly 100 uses as a lead.
Edit: I changed my mind. To most people who care, anything I would have to say on the subject should already be apparent. Furthermore, while I believe I understand many of the reasons behind this month's stats, I still need more experience before I can make a comprehensive review of changes in the month.