Boldore are rock pokemon, with all the vulnerabilities that implies, yet have become surprisingly valued among prospectors for their tendency to travel vast distances in order to seek out groundwater. Initially it was suggested that Boldore engage in these searches out of excessive, almost paranoid preparation; should they know everything in the area which can kill them, these oft-sedentary pokemon can far better defend themselves from danger. The problem with this theory is that groundwater can not kill Boldore, only wound them, because Boldore are virtually indestructible.
This fact only renders the behavior more puzzling, and attempts to explain it in human terms have frequently invoked absurd metaphors such as flying pokemon flying into thunderstorms and bug pokemon looking for flames. Boldore appear to gain some benefit from the water, at least in this peaceful form, although the same substance remains very painful to experience when shot at them from another pokemon's mouth.
Currently, it is most often suggested that Boldore use these small sources of water to do exactly what water typically does to rock pokemon, but in a safe and controlled manner. Left alone, Boldore tend to accumulate rock over the course of their lives, a process which initially makes them a larger and stronger pokemon. But although the very fact that these pokemon can move on their narrow, orange crystals in the manner of unguligrades speaks to those items' immense power, even these crystals have limits. A Boldore which grows too large becomes more sluggish than a Slaking, and it is to avoid this fate that these pokemon learn to find water even in the driest of caves. They will gladly help out humans who wish to use the water in many ways the Boldore find alien, however, for they consider mankind their friends.