Heres some strengths and weaknesses to evolving Pokemon, when evolved they will learn moves slower and may not learn a move that its pre evolution would have Example Pikachu can learn thunder but Raichu can't unless you use a TM. Also when evolved there stats will increase more in certain categories like speed for sceptile but its pre evolution may have increased special attack more, But being evolved will indeed make you stronger, also when evolved a Pokemon can now breed and make its pre evolution Example Electabuzz is fully evolved and when you breed it its pre evolution is elekid. Basically evolving has stat benefits and some move benefits like they may not be able to learn a certain move like earthquake until there evolved. Evolution is not bad but it has a few disadvantages so if you want train all forms of a Pokemon and compare which is better.
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Give them a everstone or press b when they are evolving ;)
It stops the pokemon from evolving
The everstone stops evolving all Pokemon that evolve in the first place.
There are two ways to stop a Pokemon from evolving. The first is to give it an everstone, which prevents you from working everytime the Pokemon is ready to evolve. The second way is to press "B" when the Pokemon is evolving. If you did neither, then your Pokemon is not ready to evolve.
If you accidentally pressed "B" while your Pokemon was evolving, all you have to do is level it up again.