Examon is the royal knight with the most data of all the knights. However Alphamon is currently the strongest digimon of all. This obviously does not replicate in the game due to balance issues. Alphamon is literally a fool in everything you can think of.
Omegamon the truth is that among the royal knights he is one of the weakest. However, if he has the X gene, he becomes the second most powerful.
Alphamon is not the strongest. He's one of THE strongest.
There are many reasons why Alphamon is the strongest digimon if you investigate their abilities, you would understand why I make this statement. He simply has too many broken skills that make no one can compare.