Most Pokémon, even genderless, can breed with Ditto. It turns out to be the species breeded with Ditto, but always the first evolution. So you'll get a Chimchar again, even if you put Ditto and Infernape to Daycare.
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you must must have one of these following Pokemon to start with: chimchar, monferno, infernape then either put it in the daycare with any of the three "OR" a ditto it does not matter which one's you choose you will still get a chimchar XweaselX
the you put in the daycare for a darkrai egg is a ditto
a ditto
Put them in the daycare together
Nothing without cheating due to the fact mewtwo cant breed.