It depends on which meowth, if you're talking about the one at the end of the Hoenn saga, then its trainer was Tyson. But the meowth that has been around since the start of the series technically has no trainer. He is on equal par with Jessie and James and treated as such.
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Meowth is a pure Normal-type Pokemon. As its Alolan form, it changes to a pure Dark-type Pokemon.
Meowth is not in the wild in Pokemon Yellow. You have to trade to get it
Pokemon Yellow does not have meowth and it can only be obtained by trade.
Meowth is right of celadon
Meowth are Pokemon SoulSilver-exclusive Pokemon. In SoulSilver, they can be found on Routes 5-8, 38 and 39.