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Not bad for F2P but I'd rather see it as a paid game like Pokemon Battle Trozei. At least Pokemon Shuffle is more newbie-friendly, which is nice for relaxing gaming. On the other hand with Battle Trozei is insanely hard to catch later Pokemon and you will often need the help of a walkthrough in order to find out how to catch them (pretty much like in core Pokemon rpg games).
At least Shuffle gives me a good motivation to finally complete my Pokedex on Battle Trozei.