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gen 3 uu overrun by psychic types like grumpig, lunatone, and hypno
while generation 3 had no shortage of dark types, sneasel was unique for its speed tier and access to swords dance, physical shadow ball, and brick break
while the turn of the generation blessed sneasel with new physical stabs like pursuit, ice shard, and night slash, it was also the same generation that introduced mons like froslass, weavile, and mamoswine, two of which exceeded its powerlevel as a physical ice type and all of them having a similar speed tier or access to priority in the form of ice shard, so ultimately sneasel became utterly useless. on the bright side, most of the psychic types that terrorized gen 3 uu were also moved to nu, so it moreless kept its old niche
tldr split didnt kill sneasel, better options did
