There really isn't a best Pokemon team for the Elite Four. All you need are strong Pokemon, items like full restores, and Pokemon you have trained all along your journey. But, your best bet is to use your starter and maybe a few legendaries. Pokemon who are good against all the people will do as long as they are high leveled.
pickachoo
get the ruby sapphire
When youre versing the champion
You will receive it after beating the elite four and defeating Team Plasma.
The best way is to give a weaker Pokemon a exp. share then keep beating the elite four. If you can't beat the elite four then you might want to use the vs. seeker and look for trianers to battle.
level 100
I think an: .Infernape .Giratina
in what game of Pokemon
FAP
You find him in meteor cave after beating the elite four.
Beat them and the champion
Have a good Fire and/or Ground Type...
hacks. and pokemon that are able to evolve with the dusk stone won't until you get the new pokedex (after beating the elite four)
Prof oak after beating the elite four.
At 'N's Castle after beating the Elite Four.
by beating the Elite four. no i TRIED THAT ass
pickachoo