Copying our pokemon isn't the same as copying Nintendo pokemon. Nintendo have given their views on fangame and have said that they're ok with them as long as proper credit is given. We, however, don't want our pokemon to be used in other people's fangames since we didn't have a whole team like Nintendo did, it was just the two of us and it took a lot of time and dedication to come up with their designs and sprite them.
That's like saying you can copy someone's artwork and, as long as you give them credit, it's ok to not ask them. Everyone feels differently about others using their artwork -i personally don't like it.