Continuing on from a previous ask about Sableye, I live on the seaside and I find my Sableye, Jester, eating a lot of sand. He doesn’t seem to be unhealthy or in pain, but it’s unclear whether or not I should stop him based on his stone-based diet.

It depends on whether you mean he’s eating sand in lieu of rocks or in addition to. If he’s replaced rocks with sand entirely, he may find some difficulty meeting his nutritional needs. If you can supply him with stones, it’s best to nudge him back onto a stone-based diet. If, however, this isn’t within your means, try putting him on poké kibble but allow him to continue eating sand to supplement that diet. 

The important thing is that he receives the best possible diet to support his body, and to be honest, sand is a decent source of minerals. The problem is that it isn’t as hardy as a purely rock-based diet, so at best, on a sand-only diet, your sableye may become lethargic or lose a few of its jewels. At worst, your sableye may suffer quite a few health issues, with the most severe being a weakened skeletal system, depending on the exact composition of the beaches by your home. Supporting a sand-only diet with poké kibble may at least provide a baseline supply of vitamins and minerals to keep your sableye going, even if all it consumes otherwise is its species’ equivalent to sugar.