Pokemon ability class

[SpiffyRegice]

I read this: http://www.smogon.com/dp/articles/pid_iv_creation#finding_ability_from_pid

and this: http://projectpokemon.org/forums/search.php?searchid=60203

However, I'd still like something explicitly clarified. If any pokemon has only one ability, it can fall under class 1 or 2, correct?

Furthermore, how does the game treat pokemon like giratina, which can have abilities that change?

[wraith89]

It doesn't matter which class a Poke is if it has one ability. So yeah, it can either be class 1 or 2 and you can get away with it.

Giratina's class will always remain the same even if it switches from one form to another.