Should be ready for E4. It's pretty good. Mine pre E4 was Lucario, Serperior, Espeon, Zoroark, and Crobat. Can't remember the levels, but post champion they were all 57-58. You should be able to win, since your team is a bit higher leveled than mine was at the start.
Now, though, my team is all six psuedo-legendaries, all 88-89. It's absurdly easy with them. --- Most badass noob ever. No exceptions. Except the noob part.