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Lapras is only really useful against D-nite in this meta, and you can get more efficiency out of just leveling a Cloyster (got plenty of candy from the Solstice event). Cloyster base defense high enough to tank at least one Dnite matchup if you have two ice moves and around 2000+CP. It's not optimal for raids either, so save your stardust for something a bit more useful. You could even use Dewgong or Jinx with ice moves if you don't like Cloyster.