you have to train it ( by wining battles, beating wild Pokemon) and it will gain experience
Soon if you train it a lot it could evolve ( most Pokemon do that by leveling up)
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Fighting pokemons with almost the same level.
A hard stone is a hold item, to give to a Pokemon to make their rock (or ground)type moves stronger. It doesn't make any Pokemon evolve.
yes they are
if you stock them on calciums etc. then yes, but it all depends on their natures.
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