No, a Fire Stone won't work on Monferno. Monferno evolves at level 36.
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Lucas has a Monferno.
Monferno evolves at Level 36, into Infernape.
Monferno evolves into an Infernape at level 36.
Chimchar evolves into a Monferno at level 14 and then a Monferno evolves into an Infernape at level 36.
There is no wild Monferno.You can only get Monferno by picking Chimchar as your starter and evolving it.