Its a player designation, not an effect, ability, or trigger, which means you are the monarch (
The two meet at the SeeD ball held at Balamb where they share a dance, and join together when Squall is sent as part of a SeeD operation to assist the Forest Owls, thus kicking off their long and winding story
You could just cast Beanstalk Giant if you have need of smashing now or you don't want to risk Fertile Footsteps getting countered
Its not unusual for a Special Rare to be valued at $100300 or more, depending on character popularity and demand
Some cards can exert yours to open up a challenge
A very easy condition to meet, but you can't twinkle toe around it, you have to put in the work