He captured it since it was a Bellsprout and when he taught it several attacks, it evolved into a Weepinbell. Later, James taught it how to do vine attacks against other Pokemon and it evolved into a Victreebel.
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Victreebel
You have to catch a Bellsprout or a Weepinbell (Evolves from Bellsprout). Then you can use a Leaf Stone on the Weepinbell and it will become a Victreebel.
Victreebel does not have an evolution. It is the second and final evolution of Bellsprout. Nothing comes after Victreebel.
The Leaf Stone can only make 5 pokemon evolve. Gloom into Vileplume, Weepingbell into Victreebel, Exeggcute into Exeggcutor, Nuzleaf into Shiftry, and Pansage into Simisage.
Bulbasaur Ivysaur Venasaur Oddish Gloom Vileplume Paras Parasect Bellsprout Weepinbell Victreebel Exeggcute Exeggutor Tengela Bellossom Hoppip Skiploom Jumpluff