I have beaten the E4 several times, and am working on pokedex/stickers/training my team. Right now, four of my team members are level 100, and one of them is in the 70 - 80 range, and the other one isn't hatched yet... But I'm working on it. I've caught all the Kanto pokemon except Charmander, Charmeleon, Charizard, and Mew. I've traded over some Hoenn pokemon, but there are still a lot more to trade over. I've caught all the Johto pokemon that are obtainable in FR/LG except Blissey, and only some of the Coloseum pokemon. Right now, I have the 1st level sticker for E4, and the 2nd level sticker for hatching eggs.
Oh, and one more thing, I'm trieng to obtain enough PP UPs/PP Maxes to max out all my team members moves. Right now, I'm about half-way done with that.