The Friendly Wither is a pink wither that was implemented in the Love and Hugs Update and Minecraft 2.0.
How to spawn[]
in the Love and Hugs Update you spawned it in normally, whereas Minecraft 2.0, you spawn it using a block of pink sheep wool, a flower pot, and a poppy stacked in that order.
Differences[]
As the Wither mob is a hostile mob that will spit skeleton heads at you, the Friendly Wither isn't hostile (although it's still considered a boss) and spreads flowers/bonemeal wherever it goes.