mirage island

where's the mirage island? some people said that i need to have a special pokemon, and then the old man will be able to see the mirage island. if so, which pokemon do i have to catch and where is that island?
thanks for your help

is there a way to say that in an understandable way for people like me.

the place i find this might explain not much better.

Every Pokémon that has a gender can be male or female, and that is set by a random value that goes from 0 to 255 (00 to FF in Hex). The value from which the gender goes from female to male is called the gender breakpoint. Most of
the Pokémon have a gender breakpoint of 128, that means the female gender value will have a value from 0 to 127, and male gender value will go from 128 to 255. That also means they have 50% to be male, and 50% to be female. You can
tell a Pokémon's gender breakpoint value by looking at Meowth's site's Pokédex (www.pokefor.tk,then choose "Tools"), and look at the gender percentage of a
Pokémon. Take the female percentage, multiply it by 256, and you'll have the Pokémon's gender breakpoint. For example,you can see from Meowth's Pokédex that Machop has a 24% chance to be a female. 0.24*256=61.44. Round it
down, and you'll have Machop's gender breakpoint value : 61.

By knowing this, you can tell what are you chances of a female Pokémon to be
Mirage Island Friendly by multiplying the gender breakpoint by 256.

Here are some examples :

-Genderless Pokémon (or Pokémon that have always the same gender) will have
1 out of 65536 (256*256) to be Mirage Island Friendly.

-50% Female/ 50% Male Pokémon will have 1 chance out of 32678 (128*256) to
be Mirage Island Friendly if you catch a female.

-24% Female/ 76% Male Pokémon will have 1 chance out of 15616 (61*256) to be
Mirage Island Friendly if you catch a female.

-12% Female/ 88% Male Pokémon will have 1 chance out of 7936 (31*256) to be
Mirage Island Friendly if you catch a female.

This won't give you more chances to get an Mirage Island Friendly Pokémon (chances are always 1 out of 65536), but it'll save you lot of time, because you won't have to catch every Pokémon you encounter and check if they are Mirage Island Friendly. But you'll still have to encounter "65536" Pokémons to find the good one...And remember, only female Pokémon of Pokémon that have a gender, are valuable.

might still be confusing.

im like so confused, what are these mirage island pokemon, for example, are they like a pokemon called pikachu or something, what are they

where- anywhere in hoenn.
how- that's just how it was done.
when- any wild pokemon you encounter can be it meaning anytime.
why- no clue.

A little clearer, please. So, you're saying that for example a torchic. Female torchics are rare and if you get one you will have 1 out of 7936 chance that it will be a mirage island friendly pokemon? Is that what you're saying? Tell me if I'm wrong.

why go to mirage island then if you can't get anything good

Actually the Enigma berry is the rarest. Dont know how you get it though....