>>31904455Recover and Extreme Speed. It would make running Normal type Silvally viable, thus allowing things like Z-Parting Shot sets, and it's decent bulk would be accommodated by a recovery move.
Someone else stated the Memory Disks should be a key item so you can change Silvally's type remotely while also letting him hold an item, or making Silvally change types with Z-Crystals, or at least give Memories a 20% STAB bonus so Silvally doesn't need a Swords Dance to deal good damage.
What's odd is that Silvally is in a good position to be one of the flagship Pokemon of Gen 7, and GF knows what to do to make a Pokemon viable (see: Mega Charizards) so it's confusing as to why GF would gimp Silvally's moveset so hard. He doesn't even get Earthquake. Silvally has so many tiny but critical flaws that could be fixed so easily, that it almost feels like GF intentionally made him lackluster.
Also, Disgaea has cuh-rayzee specials. You should check it out if you're into that kinda thing.