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>Base stat boosts:
+10 HP, Atk, Def, Spe and +15 SpA, SpD
>New Moves:
>Follow Me, Taunt, Encore
Delcatty already has a few good doubles moves like Fake Out, Helping Hand, and Icy Wind, so we'll just give it a few more.
>New Ability: Normalization (replaces normalize)
>All moves used by and against this pokemon are Normal type. Also, the power of this pokemon's moves is boosted a little.
Along with the normal effect of Normalize, every move that hits Delcatty is treated as Normal type. This effect applies before STAB, so moves used by non-Normal types will not have STAB when hitting Delcatty.
To prevent degenerate combos, this ability can't be copied or swapped. And it also prevents Delcatty's type from being changed (because otherwise Trick-or-Treat).
Now it's not complete trash and has a unique gimmick.