I have one idea here that could be useful. It's only really a thought, probably not very good, but here I go anyhow.
Normalize could be used to have Skitty/Delcatty use moves on Rock-type and/or Steel-type Pokemon that would normally be super-effective otherwise, or could be used to give its own moves the ability to hit opponents that would otherwise be immune to them.
For the first example, you could use Wake-Up Slap on your ally to deal less damage while also waking them after a Rest or Hypnosis or the like. For the second example, you're actually able to use a Normalized Thunder Wave on Ground-type Pokemon (though it becomes ineffective against Ghost-types). Going off from the second example, this means you can also use Thunder on Ground-types, though considering Delcatty has a whopping 55 Special Attack I'm pretty sure it's not happening. Though the ability to use Toxic on Steel-types is a pretty nice thing...even though Salazzle can do that way better now. Dream Eater on Dark-Types, Mud Bomb on Flying-Types...I mean that's pretty much it with Skitty and Delcatty.
Gods I wish they had Entrainment, that would make them so much better to use.