He's trying learn details about the legendary pokemon. Primarily/ostensibly to be able to better prevent/deal with a situation like what happened with the Rocket plot earlier this year, but being prepared to know what to do to get on a legendary's good terms should he ever encounter one again is up there, too.

That, and he also has a plan in the very, very early stages to potentially try to strike back against Team Rocket from a direction no one's really used before, and which will eventually require recruiting people with considerable technical knowledge (hacking, security devices, possibly even modern weapons and especially defending from such, etc) to assist with if it actually goes anywhere.

Obviously there are plenty of uses he could put a profiler with a flawless memory to on either/both of these.