It doesn't learn Mach Punch.
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It can learn Mach Punch, but it should be able to learn upon evolution. Breloom is able to learn Mach Punch at level 23. If you think it was forgotten, it can be relearned by the Move Reminder in Fallarbor Town. If you are playing Pokemon FireRed or LeafGreen, the Move Reminder can be found in Two Island in the house next to the Game Corner.
At level 14 when it evoleves into monferno ________________________ I believe this is incorrect. I have a level 32 Monferno and it still hasn't learned mach punch. I believe it learns it when Monferno evolves into Infernape, but this is just a guess.
Chimchar Evolves into Monferno @ lvl. 14 but when it gets to level 14 let it evolve or it wont learn mach punch.
Mach Punch is not a TM so therefore it does not have a TM number.
Level it up until it evolves into a Monferno, then level it until it learns double kick, double kick is super effective against all the gym leaders Pokemon. that bull crap here how it goes that monferno don't learn double kick it will learn mach punch which isn't very strong but very much fast it will evolve at lv14 guys shut up it learns both double kick and mach punch so i will settle this when your chimchar evolves it will lern mach punch later on in the evolstion it will learn double kick SORTED There is a much simpler way. Just catch a Machop train it to level 7 or 8 and beat all the gym trainers.