So whats the problem in these fake games?
Well they will be glitchy - poor quality and probably break quite quickly - possibly damaging your console too. For a poor quality rip off it isnt worth the risk. Go for the geniune game and get the full enjoyment out of it!!
These are all fakes - not "rare" and should be avoided. No real collector would own one and they will not be worth anything in the future.
Pokemon Chaos Black
Hacked game and totally fake - it will become glitchy and unplayable
Pocket Monsters Go! Go!
Fake modified game.
Another hacked fake game.
Pokemon Diamond Version
A real looking box and cartridge - but a fake game.
Another real looking box - but fake game.
2-in-1 Games: Pokemon Crystal/Diamond
Another hacked cartridge (most multi game cartridges will be).
As the POKEMON series of games are so popular more fakes are bound to follow.