Verified answer

That was Pokemon the movie 2000. The three legendary birds were awoken and 'the world will turn to ash'. I stopped watching pokemon years ago so there might be a follow up episode I don't know about but the movie was their first meeting.

there was an episode where he meets a baby lugia, but that was a long time ago

he does not meet him in an episode it is in the pokemon movie 2000, where he meets articuno,moltres,zapdos, and lugia.

i hate pokemon...

sry, idk. there are so many seasons and episodes that i can't keep track!! but i don't watch anymore.