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After keeping my slowly dying Omegamon Alter S on ice for about a week i finally got to jogress up my Rust Tyrannomon.
Now when i get a minute it will be time to smash through all 100 double battles.
Also. Despite already doing all 100 solo battles myself, apparently the hackmon egg unlocks after any 100 battles. So you can keep restarting if you want.
Humulos has a list of all the coluseum fights along with its growth charts.