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This is off the top of my head, but I think it's stolen from a unit in the last X-Dimension stage.
Claiomh Solais Overlord Suit Aegies Shield Exodus
Each one is around Level 1200 and you're basically limited to front stealing so you'll need around a level of 1325 for a 99% Steal (1400 if you're aiming for Legendary Rarity 0). Assuming you're using a Bandit's Hand, anyway (50 HIT).