Pokemon evolution is a simple concept at heart. You get a Pokemon to a high enough level and they change into a better Pokemon. Some Pokemon might change again, and others - usually rare, late-game ones - might not change at all. Broadly speaking, Pokemon evolutions just work. They're one of the best and most exciting things about the game, especially if you go into a new generation with no idea of what's in store. All of you who chose Sobble in the last gen, you have my sympathy. We love evolutions, but why do they need to be so complicated these days?
It's not just through reaching a set level, but that's not always a bad thing. There are also item evolutions, such as Vulpix needing a Fire Stone to change into Ninetales. This introduces a layer of strategy, because Ninetales has better stats, but evolving too early can mean missing out on learning powerful moves. This is still pretty basic. So are trade evos, like Haunter, who will evolve when traded with a friend - unless that friend is a bitch named Mindy. I don't especially like trade evos, because I think it's silly that we have two different versions of the same game and wedging multiplayer conventions into a solo experience, combined with Nintendo's bad online framework, is irritating and pointless - but at least I can easily explain them.
Related: It's Time For A New Type In PokemonThere are even item trade evos, where the Pokemon must be traded holding a certain item, combining the two ideas above. We're getting away from natural evolution now, because no one is going to trade Scyther holding Metal Coat unless they're doing it on purpose to get Scizor, but at least the steps you need to take are pretty simple. If these are the types of evolutions in Pokemon:
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