4 Princes and there 4 maidens

In a kingdom long ago a king and his queen took in four abandoned boys to become princes, stories were told that at the age of ten royals must have a party for being able to train with pokemon's while being able to train in ninjutsu and get a pokemon that would show there paths for the futur, once nineteen these four boys would sooner or later will need a wife to marry to become king of the kingdom or at least of a kingdom.

But what happens when something happens in both there love life and pokemon life?