Welcome to my head canon

Or, more precisely, a random idea that was partially inspired by a deviation / series pointed out by .

This is how one could legitimately cross 'Wreck It Ralph' with 'Code Lyoko' -

This would have to take place during 'Evolution', after the reactivation of the super calculator. A weakened XANA would be loose in the internet, and somehow end up arriving in the arcade where the old Wreck It Ralph and Sugar Rush machines are hooked up.

In his weakened state, XANA infiltrates the Hero's Duty machine and starts to corrupt the coding of the various enemies in the game, regaining some strength in the process.

Jeremie sends the Lyoko Warriors into the 'net in the Skid, their travels taking them to Hero's Duty. There they encounter Ralph, Vanellope, Felix, and Calhoun.

Epic team up. Epic battle. Yadda yadda, yadda.

Not sure what would happen next, as this is just a train of thought of what could happen to create a *good* crossover between two series / franchises.