There is no legetimate game by the name 'Pokemon Indigo.'
Simply defeat another Pokemon either from the wild or a trainers Pokemon.
You level up by battling wild Pokemon, Trainers, and Gym Leaders.
You cannot hack Pokemon Indigo, however, if you want a cheat/tip, on a Pokemon battle, (wild) make it faint and then refresh the page. (You'll see what I mean if you do it)
sign up the login all you have to do is battle gym leaders or walk in the wild with the arrow keys the if you find a Pokemon go to battle and then attack
A cheat that modifies the Pokemon that will appear in wild.
simply just click on an island on your map then you go in the grass then Pokemon will appear
purchase balls at te store then go to any part in the wild click the arrows to move around when you see a Pokemon appear weaken it then in items click use pokeball
It changes the wild pokemon that appear in the game.
Pokemon indigo does not exist
Defeat wild Pokemon or trainers Pokemon then go to the Pokemon center and heal your Pokemon notice your Pokemon's level went up.
Electirizer is sometimes held by wild Elekid which only appear in Pokemon Pearl if you have a copy of Pokemon FireRed. To make the wild Elekid appear you need Pokemon FireRed in the GBA slot of the DS. Once this is done wild Elekid should start to appear on Route 205 and the Valley Windworks.
wild pokemon? my guess is that it's random