Monferno actually exists, and it can be found in real encyclopedias. You may read more about it on the following wiki(s):

Monferno is a dual type Fire and Fighting type Pokémon that debuted in Generation 4. It evolves from Chimchar at level 15, and evolves into Infernape at level 36. They are fourth Generation Playful Pokémon who resemble monkeys like chimpanzees and baboons. It has a orange body with a blue mask on it's face, it's thin tail has a flame on the end of it. It evolves into Infernape.

National Pokédex
← #390: Chimchar
#391: Monferno
#392: Infernape →