There are 3 roaming legendary bird in my platinum which already low on HP, I'm ask cause I'm affraid they have roost and use it when I sent Wobbuffet... please help me, they are Articuno, Zapdos, Moltres.
No, none of them have Roost. Here are their movesets:
Articuno: Ice Beam, Agility, Ancientpower, Reflect
Zapdos: Ancientpower, Agility, Charge, Discharge
Moltres: Ancientpower, Flamethrower, Safeguard, Air Slash