Getting the alucard sword

Answer from: AlucardGlitches
Bug: Get Rare Weapons. Make a copy of the game to avoid screwing save file.
Choose the copied save and make sure you have the Cinquedia weapon-- Hammer sells it. Warp to Mine of Judgement and enter the Abyss to reach the first save point. Equip Succubus bullet-type soul and Cinquedia. Save your game here so you can redo the bug to get desired results .
Stand near the left wall and use the Succubus attack (UP + attack) and quicky cancel with special attack. Quickly attack three times and do another special attack--you should be through the wall. Press down + jump to slide--watch your map and you'll see your dot move to the right.
Move to the left side of the screen and wait for about 5 minutes. When your dot stops moving, hold left on the d-pad to move back to the right side of the screen and continue until you re-enter the map.
Your controls will sometimes be messed up -- you can reset them to default to fix them. Check your swords and bullet-type souls. You'll randomly get weapons you can't normally get -- alucard sword /whip -- and souls from other characters, like Belmont's abilities. (Source : IGN)