Dewford, Rustabord, the thunder gym and the one lavaridge one
Yes, you need all eight badges to battle the elite four in Pokemon pearl.
No,all badges are requirments in all versions of Pokemon before battling the elite four..
Pokemon badges in leaf green is a proved sign that you beat a gym. And it makes it so you can battle the elite four or people so call it The Pokemon league and beat the game.
You have to go to the separate gyms. And then win each Gym battle
battle red on top of mt silver
you have to use three Pokemon in Single Battle two in Multi Battle four in Double Battle three in Wi-Fi Battle
The Pokemon league is where after you win 8 badges, you get to battle the elite 4 (four tough trainers) and the champion of the region (in diamond it's Cynthia until you beat her).
An elite four is four elite Pokemon trainers who, after you get all eight badges, should be waiting to face you. These are four of the strongest trainers you will battle, unless there is a fifth person (rival) who you will have to face one after another with no Pokemon centers or poke marts.
there are 8 badges in Pokemon ruby like all the others. :) tehehe
Highe level Pokemon obey yu, use HMs outside battle, increases to your pokemons stats and entry o the elite four.
you get all the gym badges and battle the elite four on an island you get to after you get the fourth gym badge
in order for trader Pokemon to listen to you. you need gym badges if you have al 8 badges they will obey and if you have 3 or four badges is going to e hard to train Pokemon