you can evolve buneary by having level up with its happiness value at 220 which means it loves you a easy way for that is to use the soothe bell from a lady in the Pokemon mansion which is on the route under heartthome city.
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Buneary evolves into Lopunny.
Once traded from Diamond, Pearl, or Platinum, you can evolve it with max happiness.
It evolves when friendship is max out.
Max out it's happiness.
max happiness at 25. it will evolve. good luck.