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When you buy the game, it is already beaten. The moment you start up the game you're launched into the credits and you start the game back at your house and everyone already treats you like the champion. You have a preset team, random six out of the following: Chesnaught, Delphox, Greninja, Venusaur, Charizard, Blastoise, Lucario, Mewtwo. The Kalos starters will all hold Ability Capsules and the rest will hold their respective Mega Stones, version dependent for Charizard and Mewtwo. They'll all be Level 100, and you'll be given the EXP Share immediately anyway, just in case you want to catch some more Pokemon and raise them. Actually, no, you don't catch Pokemon, you have the ability to instantly let them join you no matter what. All trainers will surrender to you upon seeing you, and though you're technically the Champion, you can still "face" the Gym Leaders and they'll also surrender immediately. Team Flare will already be defeated, but the remaining ones will be terrified of you. Nothing can go wrong. You are the perfect trainer, and you didn't have to work for any of that, at all.
THAT is how easy it will be.