PokéBase - Pokémon Q&A
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1 Answer

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If you want to know that your Pokémon is from a Japanese game, just check that Pokémon's pokedex entry. If it is from a Japanese game there will be a little [J] on the Info section of that Pokémon's entry. Then you know you just got a Japanese Pokémon. You can also then read that Pokémon's entry in Japanese.

Hope this helped

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Another option is to check if it has a Japanese name. But that's a redundant answer, so I won't put it in an answer. :3