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And here is the last of the three Pokémon Center sisters.
They have actual names! The nurse's name is Trista, the market seller's name is Tricia, and this one is Trinnia.
So that's the last NPC for a while, because the new ones DeNA added are numbered in the five and six hundreds. But there are not that many characters currently. I hope those numbers mean that they will add characters for a long time.