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Ash gives his Riolu an undue amount of attention, which makes Pikachu jealous. When Delia comes to visit, she gives Pikachu a much warmer treatment than Ash, and when Delia leaves, Pikachu decides to walk from Vermillion City to Pallet Town. Uncle Mime is there to protect him as he makes the voyage. All in all it's a pretty heartwarming episode, aside from the fact that Pikachu and Uncle Mime WALKED from Vermillion City to Pallet Town (which took months in the OS) while Ash presumably took a train there and waited for them.
I don't like things ironically because that's for cowards, but my love for Uncle Mime did change from "it's funny that Ash's stepdad is a Pokemon" to "top ten anime dads of all time." Maybe it's just from the Shudo novel, but everything Delia touches these days is golden for me as well.