This is a nice touch. I shouldn't be the only one to think that Normal lost too much in this generation when it lost Togekiss. Having practiced with normal mono in gen5 I can verify that. I guess you can say Lopunny made up somewhat. Also, you forgot that Normal also has Mega-Bird-Jesus.
I think that one eviolite user is enough for your team. So for this reason I thought that a bulky defensive Staraptor is more viable in monotype teams.
Staraptor @ Leftovers
Ability: Intimidate
EVs: 248 HP / 8 Atk / 252 Def
Impish Nature
- Close Combat
- Brave Bird / Tailwind
- Roost
- U-turn
That Intimidate is crucial at some points. Chansey can only sit and watch as the opponent sets up to kill. If they are behind a sub, you can take the turn to Seismic Toss it away, but you won't have that precious toxic. Both have reliable recovery (soft-boiled and roost), but Staraptor can help dispose of the opponent by putting a Tailwind, live the hit and do a slow u-turn out for your Diggersby or Lopunny. You won't even care if Lopunny hadn't mega evolved yet, because tailwind assures that you go first. Close combat is there for some more coverage, since Staraptor is usually a physical sweeper, so it will do damage no matter how little invested it is. The added Flying type neutralizes your main weakness, Fighting and if you go for Brave Bird, even the bulkiest Fighting types (eg Conkeldurr) will receive considerable damage.
Now the Smeargle set is really situational and if not used as a lead it cannot be as effective imo.
If you decide to keep the Chansey you can always use another Staraptor set. (yes I love Staraptor)
Staraptor @ Life Orb
Ability: Reckless
EVs: 252 Atk / 252 Spe
Jolly Nature
- Double-Edge
- Close Combat
- Brave Bird
- Roost
Classic physical sweeper. It can bring towers down.
My suggestion however is another special attacker, who is underrated in the current meta.
Heliolisk @ Life Orb
Ability: Dry Skin
EVs: 252 SpA / 252 Spe
Timid Nature
- Thunderbolt
- Dark Pulse
- Hyper Voice
- Surf
This guy is there to patch your holes and sweep. Immune to water attacks targeted at Diggersby and having a STAB T-bolt to wreck opposing teams Heliolisk is a force that a normal team needs. Surf hits the Ground types that might come in to laugh at your T-bolt, but they're not going to laugh for long. Dark Pulse for coverage, as Ghost types are often to switch in, predicting normal type attacks. I would put glare over there, but you already have t-wave on P-2. Hyper Voice is there for STAB, which is nice. This guy has perfect coverage (even if H-voice does not add to that).
Also I'd throw away gunk shot from Diggersby and put Quick Attack, since this team is more effective being offensive and getting all the speed it can.
edit: Staraptor in action http://replay.pokemonshowdown.com/monotype-204969318