Cooper: He practically sees Cooper as one of his platonic siblings! If any of his siblings were to come to Johto, China would introduce them to Cooper. If Cooper needs anything, China will do whatever he can to help. He's willing to put himself in danger for Coop!

Tulio: He still doesn't know about him being a con artist, though he does know by now that he tends to be magnet for mischief. Even if China ever does find out that Tulio's a con artist, he'd still be friends with him. He'd just have to worry more about Tulio as he does Envy. Just don't try to get China caught up in the scams, or else he'll show Tulio some of his country's martial arts.

Of course, he won't go too far should things come down to that.