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.
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Episode 1. He saw Ho-oh
well actually he never leaves if you saw the episode ash meets brock he says he needs someone to go with and ash volunteers so he stays with him forever
he saw alomaloma ( or however you say it) is the first unova pokemon he saw
believe it or not, if u saw it in a pic its actually fanart..... but there is a rumor about an episode where ash and may DO kiss..... yeah they said it was a japaness Christmas specail. i don't know if they will ever release it in English
The first legendary Pokémon Ash saw was actually a Ho-Oh and it appeared in the first episode of the show however the first one he actually met could technically be Mewtwo.