SPG wrote:my suggestion is to go into mcedit (or worldedit if you have to) and clear out an entire area to the void, and make sevral platforms out of different blocks, ie leaves, grass, dirt, stone, cobble ect and see what spawns on it, that would be your best bet into figuring out on what spawns on what
Should anyone actually attempt this method, be sure to create each kind of platform at different levels (i.e. platforms of leaves, grass, stone, etc. at levels 0, 20, 40, 60, and 80.) and post your results so we can all have them. Granted, you're still unlikely to see a mew with this method unless you're planning on spending a lot of time doing it.