Before those fancy Personal Terminals, fans had to make do with a personal Rockman X.
Just in time for Rockman X4's release, the now defunct “nFlex” released a virtual Rockman X pet, reminiscent of the popular Tamagotchi pets.
Shaped like X's helmet, users could train their very own “X” by defeating various enemies. After defeating a certain amount of enemies, X will level up increasing his stats.
Compared to the electronic PET/Transer Toys, it isn't as user friendly and it doesn't offer much, but hey, it's awesome.