It isn't. Period. It is cruel, and should be considered a crime against humanity.
Slavery can never be justified.
No, slave trade cannot be justified. It is a violation of basic human rights and dignity to treat individuals as property and exploit them for labor. It has caused immense suffering and injustices throughout history.
It depends what those wishes are.
Anyone with a child.
i do you want to trade
type on trade gilbertgeronimo
yes
I might but what Pokemon do you want to trade for it?
i will what are you willing to trade
I can...
Anyone with a child.
what like to trade