Reserving for Present.
Present, take Ohm the Wingull.
Like the scientist it is named after, Wingull studies electric resistance. During its study, it encounters a lot of Electric-type Pokemon. It has a hypothesis that they do not have their own natural resistance, so it must give them some to work with. Thus, it must solo every other Electric-type Pokemon that you meet. It takes its hypothesis to Wattson to test it. After soloing one of his Pokemon, it gets the answer to its question: they DO have resistance, but it is so ridiculously small that it almost always goes unnoticed. It may now evolve, and null the "solo every other Electric-type" restriction.
As a Pelipper, it likes to use Stockpile, to increase its own resistance to Electricity. It must learn the move ASAP, and it must always use it on the first turn of any battle. You must also teach it Shock Wave by TM (yes, it gets this), and solo one of Juan's Pokemon, and one of Wallace's Pokemon.