Well congrats because now you don't! Just join up a gaming community (check), find people who like Pokemon (check), exchange Friend Codes and whammo! You're already 2/3 of the way through to being able to trade-evolve Pokemon.
It's 2016 there's no need to go outside when you can use the internet to find a buddy to trade the Pokémon and get the newly evolved back. Plus you forget that Pokémon by large is a children's game.
Personally I just use my little brother's handheld for trading purposes, not ideal but it will do.
.... "go outside the game" does not mean go outside. It means requiring you go out of your way to do so, outside of the game. GAF, Reddit, whatever is outside of the game.
I'm not even on a side here lol. But failed reading comprehension bugs me x.x Causes a lot of unnecessary problems on the internet.