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Attack values
How much will be the difference between damage made by mons with 14 and 15 attack, considering a machamp
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As others have said, it's generally a difference of half a level, or a single powerup.
To give an actual example, a 15A Machamp will hit the breakpoint against Dialga at level 36. A 14A needs to be level 36.5.
It's going to be rare that you'll find a situation where a 14A (or even a 13A) can't reach the same breakpoints as a 15A, provided you're prepared to spend the dust on it. If the specimen is good in other areas (other IVs, high level), then I wouldn't necessarily rule it out.