You cant catch it.
You can catch a gastly, raise it into a haunter.
to make it a gengar, you have to trade it and trade it back
It doesn't evolve. Gengar is a final evolution.
No.
you trade haunter with someone
Gengar is a ghost-poison type pokemon that evolves from Haunter.
Gengar(Gangar, Japanese name) is a Pokemon that's is kinda evil in a short of why (he looks like this ) he's a ghost-poisen dual type Pokemon. ya hes good ok
IT is a trade evolution.
You trade Haunter it it will become a Gengar.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
There is no Pokemon convention in firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered
I assume you mean Gengar and you get it by trading a Haunter with someone, once traded it will evolve.