Good games for 3ds dsi and ds

[AntiZen]

I just got a 3ds and I wanna know what games to get and what to avoid (I have mgs3, smash bros, kirby, pokemon rumble blast, and kingdom hearts recoded. I want to get pokemon x/y and oras kid icarus and kingdom hearts 3d)

 

[Tho]

I'll list some must haves for each system.
For 3DS:
-Pokemon X/Y/OR/AS (At least one of each region)
-Luigi's Mansion 2
-Mario Kart 7
-Monster Hunter 3/4 Ultimate (Preferably both or just MH4U. MH3U is a great game too though.)

For DS:
-Kingdom Hearts 358 / 2 Days
-The World Ends With You
-Pokemon Platinum/HG/SS/Black/White (Once again, at least one of each region)