In my opinion, it's apparent that the Cielarka Cimo and Senvida Naganto gonna be Commons seeing how how frequent they're appearing in the cupboard just like Fluganta Rato, Stranga Sciuro and Tagalo.
However, I never have seen any of Monta Selo, and I saw only a single of Ombra Vesperto for a couple of hours; my guess is that the Monta Selos will very likely be the Rare, just given how the lore in their adult stage suggests.
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Edit: just saw one Selo and caught it, I want rest until one of my capsules popped out.