The process has never been fully explained in regards to how the characters become Gym Leaders however Bryon mentions in his last episode when he was fighting and arguing with his son Roark that the associates at the Pokémon League had asked him to become a Gym Leader for the Gym in Canalave City however in other instances it's a case of a family owning the Gym like with Mr. Moore and Flannery in Lavaridge Town. Mr. Moore was the original Gym Leader but when he stepped down he handed it to Flannery. It's also the same thing with the Oreburgh Gym. Byron was the original Gym Leader there but when he left to be the Gym Leader in Canalave City, Roark took over the Oreburgh Gym for him.
There are 8 gym leaders in Pokemon lake.
the only problem is you cannot catch a gym leaders Pokemon !!!!
by defeating all the gym leaders and the elite four
There are different types of gym leaders and each gym leader has a different pokemon type.
You cannot rebattle Gym Leaders.
No, however, in Pokemon Platinum, it is possible to rebattle gym leaders at the Survival Area.
No.
you capture the ledgon dariy Pokemon
you build up your Pokemon higher than the gym leaders and the you kill the gym leaders Pokemon and as they all faint you will get a badge and you have to move on to nuger 4 gym leader
You cannot rebattle Gym Leader in Pokemon White.
the gym leaders are the same as they are on pearl and diamond. but the order you fight the gym leaders are different. Turtwig would be the easiest way through the game.
Well There is no way to rematch the gym leaders unless if you hack it!