In the Indigo League, why does Ash randomly have a Charmander?

ren

Member
Cause his original charmander evolved into a charizard (eventually and really quickly) and then the episode before, his charizard battled a mar.. something... to get the volcano badge? Anyway, after that, he suddenly has a charmander!? I'm watching them all the way through ... did I miss something?
This is like... Episode 63/64
 
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