To get Janus easier, make sure you have Sprigg.

It should be a New Game++ Game.
Go to The Bend Of Time.
Fight Ozzie, Flea, and Slash.
Make sure everyone is equipped with a For-Get-Me-
Not-Pot. Defeat them.
Go to the Grand Slam.

In Round One, use Flea, Cyborg, and a monster from Chronopolis.

In Round Two, use Gyorg, Snib Goblin, and Slash.

In Round Three, use Snob Goblin, a monster from Chronopolis, and, last but not least, OZZIE!