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There was a very specific reason for it's removal. The reliance on chance meant that no one chose a move specifically for it's ability to freeze a target, so all freezings were accidental, and often game-ending for the freezee.
Right off the bat, I see Elekid's getting an Air balloon.
Other observations:
* Ho-oh will run Facade with Poison Heal.
* Slaking's ability will not be relevant any further than "It's not Truant", considering it's only got one move that benefits.
* Galvantula's physical moveset leaves a lot to...