Also question is, what episode did Ash catch?
Major events. Ash catches the Caterpie from the end of the last episode, making it his first caught Pokémon.
Secondly, does Ash catch every Pokemon? In the 139th episode of "Pokémon the Series: Sun and Moon," Ash Ketchum finally "caught 'em all" and became a Pokémon Master.
In respect to this, what episode does Ash catch snorlax?
The first appearance of a Snorlax was in episode 41 - Wake Up Snorlax! - in which it becomes a roadblock to the next town Ash is traveling to. Ash Ketchum also captures one in Snack Attack! that was eating the grapefruits of the Grapefruit Islands.
When did Ash catch Muk?
Muk reappeared in Showdown at the Po-ké Corral when Ash, Misty, Brock, and Gary visited Professor Oak's Laboratory. Muk's first battle was in The Fourth Round Rumble, where it was selected for use in the Indigo Plateau Conference.