As far as I know, it only evolves two. These two Pokemon would be from Gloom to Bellossom and Sunkern to Sunflora.
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here is a list of Pokemon that evolve with a leaf stone on EmeraldGloom evolves into Vileplume.Nuzleaf evolves into Shiftrey.These are the only two in emerald that evolve by leafstone but there are many other Pokemon that evolve by the leafstone in other games.weepinbell into victreebellHere are the Pokemon that evolve by using a leaf stone on it: Weepinbell, Gloom, Exeggcute.
well that depnds on what Pokemon you are talking about. they all evolve at different levelsPokemon can be evolved in many different ways. Most Pokemon evolve when they reach a certain level. Some other Pokemon evolve when an item is used on them.
there is no possible way to make him evolve with out trading. you have to trade to make kadabra, haunter, and many others to evolve
There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.
You can acquire an Ampharos in Pokemon Emerald by catching a Mareep in the Extended Safari Zone after beating the Elite Four. This area contains many Pokemon not seen normally in the Hoenn region. After catching this Mareep, you can level it up and at level 15 it will evolve into a Flaafy. Then the Flaafy will evolve to Ampharos at level 30.