i used a amprados a palkia golbat machamp
Use level 60 pokemon!
Just use the move surf.
Use a fire type pokemon, fire beats steel.
all you have to do is to beat all the 8 gym leaders! Then go to New Bark and swim right... Across that looooong path you will find Indigo Plateau, where the Champion is.
You are supposed to catch it before the indigo plateau. Use the guide at the website at the URL in the related links below.
There is no Pokemon indigo
Use the Pokemon locator. In Pokemon Indigo I own a Rayquaza. Two of them. And if you want to add me my username is DialgaLiker. Rayquaza is not rare. It is super common in Indigo. Even use rooms in Pokemon Indigo.
At the start of the battle open your items and leave it open then defeat the Pokemon you want to catch and you can still use an item so just use a pokeball with this you get a much higher catch rate
So far registeel is not in Pokemon indigo unless you use firebug.
use the Pokemon locator.
Don't you know that Indigo is not existing?
the pokemon you could use to defeat her is electric types or rock and ice