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You are probably referring to episode 67, from season 1. "Showdown at the Poke'-Corral." The opening is a dream sequence in which Ash gets suctioned into a pokeball. It turns out Mr. Mime is vacuuming Ash's face.
Ash got Charizard in episode 11
Pikachu was in the Poke Ball that Ash had received from Professor Oak.
Ash battles Gardenia in the episode: The Grass Menagerie
Ash battled Norman in the episode "Balance of Power."