In Heartgold where are the Legendary Bird Pokemon found

Question

I know Articuno is in the cave at the Seafoam Islands but where do you find the other two legendary birds

Answer 1

Zapdos is found in the Power Plant once you restore the power there(once you obtain the Machine Part)

Articuno is found in the Seafoam Islands, as stated in your recent question.

Moltres is found in MT. Silver, In the last floor before the floor you battle Red in.