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.
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i think they first meet in the episode called 'now that's flower power' ;D yeah flower power is that episode you can watch it on youtube.
In the first episode of season 6.
there no Pokemon episode when misty meet dawn
Jessie gets Wobbuffet after losing her Lickitung in a Pokemon Swap Meet in Johto.
the second episode.