The old man is not a Pokemon
The old man shows you how to catch pokemon.
you get the pokefltue from the old man
You can't catch Pichu because you have to breed him at the Old Man or Old Lady.
your gay jk there is no old man glitch but if you use a pokeball you can make a masterball out of it
You can't catch any of the starters from Red, Blue and Yellow. You have to trade with those games using the Time Capsule that Bill built and will be available when you reach Ecruteak City. Just remember that you can't trade new Pokemon and you can't trade old Pokemon with moves not found in Red, Blue and Yellow. Just old Pokemon and old moves
You cant catch Gengar in there, only Gastly and the Rotom in the tv.
He disappears....no one knows where he goes...its a glitch in the programming of the original Pokemon games.
You can catch Rotom.
Oak is a very old krinpled man in the hood that gives you squirtle, Pokemon charmander, dies if hit by water or bulbasur, the Pokemon.
magikarp.....
you can catch a porygon in Pokemon diamond by going to the old man in the mansion and out to the trophy garden. You also need the national dex to catch a porygon . walk around the grass and in a little while it will appear.
In Pkemon, Virizon is in the second part of the Pinwheel Forest. You would find the old man who says, "There is strong Pokemon beyond this point," and go behind him.