The best strategy was to always run in the opposite direction and keep firing projectiles at him.

And then when you unlocked him you were perhaps the most unstoppable force in that game, it's kinda a shame that a badass design for a Digimon is so underused and while I was so syked to see him finally get an appearance in the 2020 show, he was only there for one episode and that's him back inside the vault once again...he'll get his big break one day!