Harry would win. Not to say Ginny is bad by any means, she is very capable in a fight both Harry and Aberforth comment on her ability, but Harry is a great duelist, especially for his age.
SHE'S A PROFICIENT AND POWERFUL WITCH
Ginny was proficient at charms and curses, capable of holding her own against Death Eaters, including helping Hermione and Luna Lovegood to duel Bellatrix Lestrange.
Albus Dumbledore is the most powerful wizard in the Harry Potter. Dumbledore seemed like a lovely older man and the Headmaster of Hogwarts who only wanted the best for everyone when Harry first met him.
Ginny Weasley
After Harry got banned from playing the game in book five, and when he was stuck serving detention with Snape in book six, Ginny stepped up and helped take Gryffindor to victory in not one but two Quidditch Cups, one more than Harry!
Ginny is the youngest in the Weasley family but one would argue that she is the most powerful. The movies show a little bit of it but in the books, she can throw some pretty powerful spells right alongside Hermione, who happens to be one of her closest friends.
Ron is the better duelist and more experienced at defense. Ginny is as competent as the average D.A. member which means she's quite a bit more competent than students who didn't receive any proper training. After all, the D.A. members learned a variety of spells, including the difficult Patronus Charm.
1 Bellatrix Lestrange Is A Natural At Magic
Bellatrix can cast the most potent dueling spells with ease, to the point she can duel multiple Order of the Phoenix members and treat it like a game. She terrorized the wizarding world nonstop until Molly Weasley finally dispatched her in the Battle of Hogwarts.
Tom Riddle/Voldemort
Professor Dumbledore once said that Tom Riddle, a.k.a. Lord Voldemort, a.k.a. "He Who Must Not Be Named" (Ralph Fiennes/Hero Fiennes Tiffin/Christian Coulson), was the most brilliant student that Hogwarts has ever known.
The Half-Blood Prince. She kissed Harry in front of everybody. Ginny eventually began dating Dean Thomas, although she was in love with Harry during the time. Ron was very protective of Ginny and didn't like it when Ginny and Dean held hands in public at the pub at Hogsmeade.
The Tom Riddle incident
Lord Voldemort lived inside those pages, and Ginny was eventually possessed as the Dark wizard began to absorb her strength, control her into opening the Chamber of Secrets, and nearly killed her. The event, though undeniably traumatic, was a pivotal point in Ginny's life.
Ginny and the Bat Bogey Hex
Ginny Weasley's aptitude for the Bat Bogey Hex was impressive enough to earn her the admiration of no less a talent-spotter than Professor Slughorn.
Harry is the Heir of Gryffindor (though his powers have been bound by his father when he was a baby), Neville is the Heir of Hufflepuff, Meghan (OFC, daughter of Sirius) is the Heir of Ravenclaw. Harry/Ginny, Ron/Hermione, Remus/Tonks. Sixth year. After a rare magical illness Harry becomes outstandingly powerful.
The explanation is very simple - Harry has a very strong sexual desire for Ginny. He has no such feelings for Hermione. Sex is a fundamental aspect of adult relations. Sex is, in fact, the characteristic that defines the difference between a platonic relationship and a romantic one.
The Half-Blood Prince - They Finally Get Together
After years of build-up, Harry finally starts to have feelings for Ginny in The Half Blood Prince - and one of the first moments he realizes it is when he smells Amortentia, and it smells like 'something flowery he had smelled at the Burrow'... Ginny's hair!
Nobody can deny that Hermione Granger is the smartest character in Harry Potter, gender notwithstanding. She is consistently the best student in every year, earning extraordinary marks in all her exams and ten OWLS.
1. Neville Longbottom / Matthew Lewis.
Ginny was not the heir of Slytherin. The only reason she was able to open the chamber of secrets was because she was being possessed by the spirit Of 16-year-old Voldemort.
No matter his rage and grief, Harry doesn't have what it takes to defeat Bellatrix. Bellatrix is Voldemort's most loyal and most powerful Death Eater of all, and she claimed many victims in Voldemort's name.
Ginny is a feminine name of English origin. Most popularly a diminutive form of Virginia, this name means "chaste" and "pure." Your little girl is already going to be that perfect little soul you've been dreaming about; giving her a cute name to fit that just makes sense.
The Reductor Curse can blast solid objects into pieces with minimal effort. Over the course of the Dumbledore's Army lessons in The Order Of The Phoenix, Reducto becomes the unofficial spell for Ginny Weasley.
Definitely Hermione. We see this very well in the battle in the department of mysteries. Hermione managed to stun two death eaters and silence another before being finally knocked out whereas Ginny did almost nothing.