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Water.
Probably also Keldeo because my little brother used a level 100 one in BW2, my brothers and I did local wireless battles together, and he was really self-righteous that we shouldn't have flat-level battles because he got it up to level 100 and deserved to use it at level 100.
He didn't start getting so uppity about the level until after he stopped curbstomping my older brother and I when my big brother walled out Keldeo with a Water Absorb Jellicent (our brother was like 10 years old and genius enough to run Secret Sword/Close Combat/Aqua Tail/Surf) and I 6-0'd him with a Soul Dew Latias with Ice Beam for coverage that 2HKO'd Hydreigon on its switch-in from Keldeo the first turn and had a nice time one-shotting his other four 4x weak to Ice mons before taking Keldeo down with Psychic.
We laugh about it now. Actually, no, Lanturn for being boring-looking and losing Chinchou's perfect darling eyes.