Before entering Dracula's room get a cross and activate the Pluto+Serpent combo, then walk into the portal. When you fall into Hell, get on a platform as fast as possible. Dracula should come up with you or he will stay down if you are too slow. As soon as he opens his eye jump up and throw crosses like crazy. If he shoots asteroids use the Roc's Wing to jump up and down like crazy. If your lucky you won't get hit!!
Next he will turn into an eyeball. First when he charges at you use the Roc's Wing to jump and dodge him. He will make a sound before he charges. Soon he will turn into a eyeball with bats swarming around it. Activate the Saturn+Thunderbird combo. Now you should have a thunderbird at your side. When the eye comes near you the bird will shock it. You barely have to use your whip!!
Soon he will be defeated. Don't give up!!