Is a black panther is real species?

No, there are melanistic (black) forms of the leopard, jaguar, or cougar which people may consider to be a Black Panther but the fact is that the leopard/jaguar was born with melanistic (black) chromosomes instead of normal pigmentation chromosomes.

The term "black panther" is the over-all term for melanistic (black) leopards, jaguars, or cougars.

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Blacks panthers ARE real, they're just melanistic forms of the leopard, jaguar, and cougar. It's like saying the wolf isn't real, it just has many types.