Recently bought a 3DS XL, what Pokémon game do I buy from CeX?

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I bought a blue 3DS XL last week and I love it to pieces. I bought New Leaf and went home to order Pokémon Diamond for the nostalgia factor.
Yeah Diamond is fun, but having played BW, XY and ORAS (bought a 2ds last year) it’s hard to go back to my childhood favourite. I have no problem rebuying those as I barely remember them and ORAS I only got 2 gym badges as I didn’t have much spare time to play then.
My question is: all of these Pokémon games from Diamond onwards are about £20-£28 in CeX and I only have enough money for one. What one should I buy?

submitted by /u/JackalRecon7
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