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Crabrawler's legs bother me because, due to the thigh being longer than the lower leg, and the leg only having a single joint, walking forward would be difficult due to the fact that it would have a poor ability to adjust the point at which its leg touches the ground, relative to its body. It would also be completely incapable of climbing trees.
It would be able to walk sideways reasonably well, but given that this is supposed to be a boxing pokemon, I would think that they'd want it to be able to move equally well in all directions.
These problems could have been fixed simply by making its lower legs longer, or adding a second joint.
In the anime I'm guessing they're going to get around the climbing issue by just having its leg tips cling to surfaces by magic, rather than it wrapping its legs around the tree trunk like actual coconut crabs do.
