http://www.reddit.com/r/pokemon/comments/2nej67/blissey_secret_bases_thread/If I want to level up a level 1 Pokemon to a high level (50+), is it faster to battle grind or leave it in the Daycare and bike around?
Look no further my friend. This page has several secret bases with level 100 blisseys in them. It's by far the fastest way to grind for levels!