The world of Pokemon features a class of Pokemon so rare and powerful they’re in a category all their own called Legendary Pokemon. Dozens have debuted over the many generations of the franchise, but IGN’s biggest Pokemon fans got in a room and battled it out to decide which were the best of the best.
Now, this is not a list of Legendary Pokemon ranked by power alone, although being a strong battler in the game and how they made a mark on the competitive scene was a key factor in our criteria. We also analyzed each Pokemon based on how well they were designed — how cool they look and how their appearance reflects their powers and personality. And we took into account the Pokemon’s lore and how it affects the greater world of Pokemon. We vetted these Pokemon not only based on their appearances in the core games but various spin-offs, the Trading Card Game, and the anime and movies to decide the best Legendaries overall.
Source: IGN.com 10 Best Legendary Pokemon