Question

How much friendship does eevee need to evolve into leafeon?

Answer 1

Eevee doesn't need 220 Friendship to evolve into Leafeon.

Eevee evolves into Leafeon when leveled up in Petalburg Woods.

Source

Answer 2

Eevee doesnt evolve into Leafeon with happiness. In Platinum Diamond and Pearl, you need to level it up next to the mossy rock in Eterna Forest. In Gen 5, you need to level it up next to the mossy rock in Petalburg woods. Happiness evolves Eevee into Espeon and Umbreon.

Comments

You mean pinwheel forest right?

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Petalburg is in the hoeon region