I have a card in my collection that is kind of odd to me. I want to know if this is something like a hidden ability or something else. I have an Altaria from Roaring Skies. Here is the cards information.
(Here's what I think might be a hidden ability)
4 Evolution: You may play this card from your hand to evolve a Pokémon during your first turn or the turn you play that Pokémon.
(Ability): Clear Humming
Each of your * Pokémon has no weakness.
** Wing Attack 30
Weakness: Lightning x2
Resistance: Fighting -20
This is not the only Pokémon I've seen in TCG with this kind of "hidden ability" (if that's what it is) like that. So my question is, is this something like a hidden ability? If so, is there a special way to treat it or does it get used just like any other ability?