I was kind of expecting a bit more in stats, or at least 600 BST.
Type: Null will most certainly be banned from Little Cup but that's alright, as a pre-evolution it still gets some benefits such as Eviolite making it a pretty mighty wall (on top of Battle Armor preventing Crit hax).
It even has some utilities such as Scary Face, Metal Sound, Heal Block, Toxic, Protect, Thunder Wave, U-turn, and Substitute. But let's not ignore those good offense stats. And being a chimera of sorts it learns plenty of moves. Some STAB options (mainly Tri Attack and Double-Edge/Return), Pursuit/Punishment/Payback, Air Slash/Aerial Ace, X-Scissor, Iron Head, Dragon Claw, Shadow Claw, and Rock Slide.
Send it out to wall, dish out some damage, and when its low on HP either U-turn or let it faint. That is what it's like to be considered nothing.
So onto the main show: Silvally... and I was expecting more. Alright, its faster, but none of its stats are above that benchmark 100 making it feel like it falls short (which make me wonder if this is due to being used as a boss in the game). And thoguh we joke it's "Arceus Lite", it doesn't get some key moves to really run any sets Arceus can.
A physical or mixed set will probably rely Multi-Attack most of the time as its STAB so that's covered. It also adds elemental fangs (including Poison Fang), Crunch, Ice Beam, Thunderbolt, Shadow Ball, Flamethrower, Steel Wing (How? From its wing-like horn?), Flash Cannon, and Surf. You'll notice they actually went out of their way for it to not learn the high powered moved like Blizzard, Thunder, Fire Blast, Solar Beam, Earthquake, or Stone Edge; though it does get Draco Meteor but that's more from that being accessible to any Dragon-type. It also a got few more utilities like Parting Shot and Explosion.
With under 100 Speed and no Eviolite boost, Silvally kind of feels it lost more then gained. It's not bad, it has nice bulk and offensive power and with a Scarf can probably fix one of its hold backs, but that would mean you lose its type changing gimmick. It kind of feels like they did want to make a mini-Arceus but were afraid of making it "too" good.
Hm, do you think maybe Arceus could get Multi-Attack? I think it would like it.