Because ho-oh only comes to worthy trainers so ho-oh was showing that ash was going to be a great Pokemon trainer.
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Yes, Ash did in fact see Ho-Oh in Episode 1 of Pokémon.
Episode 1. He saw Ho-oh
He did not see Mew in a episode. He saw Mew in the first movie,Mewtwo strikes back.But then he forgot about it but in the end of the movie,he saw mew. He also saw marge mew.
Well first of all we don't actaully see the episode that they meet because they meet before the first episode. The story starts when ash was a kid. However, Jessie and James are adults. I could be wrong but I do believe they meet when join team rocket. You could Google the Pokemon episodes because I think the episode that has the exact time they join in the very first season. Hope I helped some.
Yes it flew over leaving behind a trail of a rainbow