All these Pokemon have some ancient story behind them, they all were once called "The Strongest Pokemon" and they all have untold stories. So, who would win in battle? Who has the best design? Who is your favorite?
Re: Arceus vs. Gensect vs. Mew vs. Mewtwo vs. Unown
Unown would win the battle. I'm just going off the top of my head, but I'm guessing Arcues would win in a battle due to its stats and diverse moveset. It might have a hard time taking care of Genesect if it wasn't using a Flame Plate, though.