You can't in order to get a gengar go to the Pokemon tower in lavender town and catch a ghastly then trade it to a friend or another gba and trade it back so it will evolve into a Gengar.
You can't catch it on Firered you can only catch it in Emerald
You can't catch it.
you can not catch him
You can catch a Ho-Oh at Navel Rock in Pokemon FireRed.
You can catch Moltres at Mt. Ember Peak in FireRed.
You can catch one in the Safari Zone...
You catch Ekans on Route 4 in FireRed.
You can not catch it in leafgreen,but in firered you can.
Only leafgreen can catch pinser.
You can only catch sudowoodo in emerald.
No. You can catch a Growlithe in FireRed in Pokemon Mansion on Cinnabar island. FireRed is the same as LeafGreen so you can catch it. ;P i have 2 of them
To get Pokemon firered on PC download a vba and Pokemon firered ROM