You need to defeat the elite 4 and Cythia and then go to snowpoint city and you can go on the boat just down from there
You can receive a Super Rod from a fisherman in the Fight Area on Pokemon Platinum, Diamond and Pearl.
The Razor Fang item is not available in Pokemon XD:Gale of Darkness. This is due to Pokemon XD:Gale of Darkness being released before Pokemon Diamond and Pearl. Gligar's evolved form didn't exist until Diamond and Pearl's release so it's impossible to evolve Gligar in Pokemon XD.
beat the Pokemon league
in fight area
The answer to that is the Fight Area. Just like almost any other Pokemon game like Diamond and Pearl.
It is northwest of the Pokemon center in the fight area. (you must defeat the elite four to get to the fight area)
At the fight area (after you beat the Pokemon league)
In the fight area.
the great marsh Or the fight area but there kind of rare in fight area
In Pokemon Diamond, I found Articuno in Safari Zone, I just don't know if it works in Pokemon pearl, (Area 1)...
You may obtain the Razor Fang in Pokemon Pearl at the Battle Park in the Fight Area.
yes you can get them in fight area