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As for your question: A Chansey evolves into a Blissey through the whole happiness factor. Simply walk around with it in your team and such until it "loves you". Then all you have to do is evolve it by raising it one level. An excellent place to ask such questions would be this thread right here: Diamond / Pearl Q& A
Welcome to the Pokécommunity, X xcrissy.
I'm sure you're going to have a wonderful time here.
Welcome to the community!
I will be more than happy to get to know you and maybe even help you out around the forums so if you ever want to chat, I am here.
Hope you have a great time here and stay active!
Its nice to have you here! I'm fine thank you! What about you? 'tis true we are somewhat of a large community! Its nice to have you as an addition to the number! Well anyway have fun, meet lots of nice people and follow the rules! See you around!