As per this question, certain monster powers in D&D 4e recharge on a certain result on 1d6. The lowest I've seen is Recharge 3-6, although the rules suggest 2-6 is possible.
Out of curiosity, do any creatures recharge a power on 2-6?
I have never seen one in the official monster list, but it is not a searchable field in the online tools.
A recharge on 2+ is not much different to a slightly unreliable At Will. Although technically possible, most monster designers probably wouldn't bother, it's an extra roll each round that might make a difference typically on 1 turn of a combat.
I should add: Technically this is also true of Recharge 6, but there is a different, and more enjoyable interaction with the player characters in that case. A Recharge 6 power is usually designed to be more powerful than the monster's At Wills, and the players will feel the need to target a monster with a strong power that "might come back next round". Whereas a power that monster nearly always has available, and is only sometimes missing doesn't really drive the behaviour of PCs in combat.
This is in no way a super-firm answer but I just looked at the compendium at monsters above level 30 (the ones I would most expect to have insane recharges) and I can't find any that recharge on a roll of a 2. Unfortunately searching recharge 2 in the compendium is no different from searching recharge and brings up roughly 2.5k hits as the results in the creatures section.