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The Machamp family lives and trains in the mountains. Thus, part of their daily training workout includes tremendous leg work on the rough uneven mountain side. Rock climbing requires immense leg strength and is necessary as they look for heavier Graveler for weight training. Although they have moved closer to human habitats in recent years, mountain training is still a central part of their life.
Conkeldurr and his family on the other hand, have been experimenting on constructing habitats closer to urbanized cities for a longer. In fact, history suggests Unovans chose to live closer to Conkeldurr populations, where roads are more convenient and the land is more suitable for building. Over the years, Conkeldurr's upper body developed well while their legs only needed to be strong enough to support their bodies.
Source: My PhD on parallel evolution and comparative niches of distant biomes
