^ The problem with Icy Wind is that we want to be threatened by Dragonite, which is hit by Icy Wind 4x SE and lowers it's speed (not sure if we outspeed Dragonite at -1).
252 SpAtk Mollux (+SpAtk) Icy Wind vs 252 HP/0 SpDef Multiscale Dragonite: 34.72% - 40.93% (3-4 hits to KO)
252 SpAtk Mollux (+SpAtk) Icy Wind vs 252 HP/0 SpDef Dragonite: 69.43% - 81.87% (2 hits to KO)
We 2HKO with or without Multiscale (SR can even give us a OHKO if we get a high roll. Also, this is assuming Bulky DD). Icy Wind has no place in Mollux's movepool.