What do I do after I beat the Elite Four!? Discussion for what you do after you beat the E4

So, what do you do?

I first transferred all my 4th gen Pokemon, discovered new lands and cities, and played the battle subway.

I saw a thread on another forum about the postgame, and there's a bunch more to be done.

Catch some pokemon, fill your white forest o:
Wow that team is somewhat like mine

Refight the E4. If you can't do that, you need to rethink your status as a pokemon player. Relocate your team from the last game if you can't think of anything else.

quote Kanon

Question.
Why am I using such crappy Pokémon?

Kanyan, just because you can't beat the game with lower tier Pokemon doesn't mean others can.

To be honest, there may be a lot to do after beating the E4 but months after beating the game it starts to run dry, at least for me. Sure I traveled around to Black City and those other places and explored a bit, and rechallenged the E4, and that took about a week. After that, I spent two days catching extra legendaries. I looked around a bit for the Seven Sages and am still missing two of them, mostly because I don't want to look at a walkthrough, and even if I did find them all I'd get is a TM I'd probably never use. So now being months into having Black, all that's left for me is to waste an hour battling opponents on the Battle Subway who don't know up from down, before getting owned by impossibly tough Battle Subway opponents before accomplishing anything. Or I can get on wifi and go straight to the owning part. I don't want to raise my team to level 100 because that's only slightly more boring than completing your Pokedex.

tl;dr, I miss the Battle Frontier. At least then I'd get owned in five different ways.

After I complete any given Pokemon game's story,I just catch and raise more Pokemon I didn't use in my main team. I'm doing that in FireRed and Emerald as of this post,actually.

Transfer all your shit over then start the game all over

I used ampharos, gurdurr, azumarill, swoobat, excadrill, and onix...
Looking for the seven sages currently.
Where is thunderus?