When I was young, the only method I knew of to evolve Pokemon was by levelling them up to a certain point. I wanted to complete my Pokedex, so I spent many hours grinding levels to try and get some to evolve, like Graveler>Golem, Kadabra>Alakazam, only to later find out that they had to be traded in order to evolve again. I was as miffed as a 10 year old can be.
So now I've created this little website to help figure out which Pokemon are safe to level up to get their evolutions, and which require other means (such as trading, or a special item).
Some of the Pokemon cards are a bit broken, which I need to figure out where in the API or the library I'm using is having issues.
Use one of the Pokedex links above to get started :)