TOMY is a company that is officially licensed to sell Pokémon brand toys, so it's likely legit. "China" in this case likely refers to the country where the product was made. Things that have proper brands on them (like TOMY or Nintendo) are probably legit products, since most knock-offs will not list a brand (though some do).
Aside from names, the best way to tell if a product is real or fake is quality. Toys that are miscolored are incorrect in some way are very likely fake. Poor quality is another identifier; knock-off Pokémon plush are usually made with cheap fabric and sewn poorly, for example.
Hopefully this helps.