Pokeballs can be purchased from marts, or obtained from item balls or NPCs.
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you can't
You can't buy them, but you can find them in pokeballs and on the ground, using the itemfinder
No you cannot catch Entei in Pokemon Emerald.
You can get it when you buy 10 - 12 pokeballs in the pokemart then you can have 1. hope i helped
Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.