Who can use the earthstone in fire emblem shadow dragon?

Answer 1

Only manaketes (ie; bantu & tiki) can use stones, and you cannot actually get an earthstone unless you use an action replay.

Even if you do though, I'm pretty sure you cannot use the earthstone anyway. you can, however, use magestones, but they are also only obtainable through an action replay.

In any case, my best bet would be to try either tiki or nagi (only in chapter 24x).