Archer is all for taking out leaks at the source! He and Kimblee are both ridiculously overpowered and tend to go for the kill though, so it might be better to have someone else assigned by Team Rocket to go after Ren.

I can offer Ryuunosuke for that! He's less powerful and likes hurting people (and killing them in canon but he can't really do that here) so he'll be content to chase after Ren and attempt to teach him a lesson for meddling with Team Rocket (not that he cares, he just likes beating people up with his Pokemon :| ).

Obviously I wouldn't send either of them after Ren until he's caught leaking information, since neither of my characters knows him very well and they don't suspect anything.