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Well, seeing as how they're using the Alola forms to patch up Alola's lack of Dark and Ice-types, it makes sense they'd do the same for Sinnoh and its Fire/Dragon problem.
So how about;
>Fire Voltorb line, ditched its disguise and became a standard bomb
>Poison/Fire Koffing line, became more volatile due to Fuego Ironworks
>Ice/Fire Vanillite line, is now a hot fudge sundae
>Dragon Ekans line, lost its venom and rattle, and lives underground
>Poison/Dragon Seviper, got a more rugged and scaly body