I don't remember the exact levels, but I know that I have a team of Blaziken, Azumarill, Swellow, Latios, Electrode, and the sixth one being either Breloom, Kadabra, or whichever one I'm training.
I've beaten Steven a couple of times, usually after I manage to outendure his Pokémon (Outstalling his Lv. 7x Cradily with a level 45 Latios)
I've gotten Rayquaza and Groudon, and I haven't tried for Kyogre or any of the Regis.
Tried and failed several times to beat the Pike Queen (Seriously, I need to train a Pokémon that knows Night Shade to a high enough level (Preferably Level 50) in order to break through that Shuckle's defenses!) Maybe I should take the Open Level path, and hopefully be ready for her so I can take her Seviper with my Blaziken (which knows Earthquake), and Shuckle with Azumarill...but what of Milotic?! I'll probably have to pull Breloom out of the Level 50 league...but then I'll probably get blasted with an Ice-element attack anyway...! Hold on a second...its physical defense isn't that great. Maybe an Earthquake will do the trick?
Okay, I've got the levels, but I just remembered that it wasn't Electrode that was part of my main team, but Linoone.
Blaziken L.66
Swellow L.55
Azumarril L.62
Linoone L.50
Breloom L.50
Latios L.47