Ok this one is just weird, and compounds on how badly these legendaries were treated outside of games. Not only are they absent in the anime until Journeys(which only showed Moltres), they also didn’t appear in the manga, have a true storyline involving them, and don’t even have a hidden ability for some reason. So let’s all give them more love than TPC or GF have, which let’s be honest ain’t difficult.
For Articuno:
\- Snow cloak(tying it to its original version & fits with it disappearing as it roams).
\- Moody(it is noted for having an arrogant & callous attitude, which could justify this ability)
For Zapdos:
\- Speed boost(obvious)
\- Motor drive(again obvious plus it could justified as it still having latent control of its electric powers)
\- Static(tie in to its previous form)
For Moltres:
\- Dark aura(It is said to have a strong presence with its dark powers, to the point of even destroy spirits)
\- Pressure(I don’t like it, but it does fit for similar reasons as Dark aura)
by Flygonizer-Obsidian