>>44817051>>44817100Ash released Butterfree to make room for Haunter and Primeape. Ash released Pidgeot to make room for Lapras and Snorlax. Ash gave Primeape up to make room for additional Pokemon he caught. Ash gave away Squirtle and Charizard to make room for Cyndaquil and Totodile. Ash Oaked Heracross for Noctowl. Ash Oaked Bulbasaur for Phanpy. Ash Oaked Torkoal and Glalie for Aipom and Donphan. Ash traded Aipom for Buizel. Misty left Starmie and Horsea home for Politoed and later on Corsola. May left Skitty, Beautifly, and Bulbasaur at home for Munchlax, Squirtle, and Eevee. Dawn gave up Ambipom for Cyndaquil and Togekiss. Jessie and James released Arbox and Weezing for Seviper and Cacnea. Jessie released Dustox for Yanmega. James gave away Cacnea because it overstayed its welcome and Carnivine was there. Jessie and James gave away their BW team for Gourgeist and Inkay. Jessie and James released Mimikyu and Mareanie for their gotcha system where they use different Pokemon per episode in the new series. Ash released Goodra for Noivern, and Poipole for Melmetal.
It happens all of the damn time in the anime. Characters release old Pokemon that overstay their welcome so they can accustom themselves to new ones. Misty released Togetic because at the time, Togetic was already fully evolved, and as a Water-type specialist, the anime wanted to experiment with Azurill for a while. Hence why Azurill did everything Togepi did but was more active and can actually evolve into a Water-type.