Its nose is always running. It sniffs the snot back up because the mucus provides the raw material for its moves.
– Pokemon White Pokedex
I think Cubchoo would’ve looked cute if it wasn’t for the fact that it has snot permanently hanging from its nose. Especially in the Pokedex 3D animation, it snorts the snot back into its nose, and it drips down again, ewwww. Its Pokedex entry also refer to its snot and how it powers up its ice moves, gross.
Stat-wise, it’s got high Attack, but not much Defenses.