454 Pokémon in the Kalos Pokédex, 721 in the National Pokédex: X and Y have the biggest Pokédexes of their era. Completing them takes organization, trades and, now, a rush to finish before Pokémon Bank closes. Here is the method.
Two rewards await you: the Oval Charm, given by Professor Sycamore when you have seen every Pokémon in the Kalos Pokédex, and the Shiny Charm, when you have caught every Pokémon in the National Pokédex, excluding Mythical Pokémon.
The National Pokédex is given to you by Sina and Dexio at Lumiose Station, after you enter the Hall of Fame.
