I like that there's barely any COTD. Characters like the Market Lady, Olu Olu, and, in today's episode, evil Hotel Guy (ik his actual name. Joke) make appearances in later episodes. Their contribution varies, but it does a lot for world building. The Kukui and Burnet wedding episode is the best example of this.
The cast, while cool, is kind of hit and miss for me. However, the 3 of Ash's friends (Kiawe, Sophocles, and Mallow) are some of my favorites. Kiawe is my favorite in all of SM. He's a determined hard worker who puts a lot of energy into whatever he's doing. Sophocles has his geeky charm. Mallow, while criminally underused, has always made me smile or laugh. She's the nice girl with a hint of sassy sarcasm. Lillie and Lana? Meh, boring.
But my favorite thing is how Ash's & his Pokémon are actually free. Ironic that the series with the least amount of traveling has Ash's team out the most. When he's at Kukui's, I get such a good vibe. Ash actually acts like a 10 year old.