There's a partner to this core that
Magnemite talked about in the older NP thread here:
http://www.smogon.com/forums/threads/np-stage-2-teardrop-victreebel-banned.3537437/page-3
Raichu a poem (Raichu) @ Life Orb
Ability: Lightning Rod
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Nasty Plot
- Thunderbolt
- Focus Blast
- Hidden Power [Ice]
Basically, the addition of Raichu makes this a double Electric core - NP Raichu can break through things like Regice, Lickilicky, SpD Roselia, Piloswine, SpD Clefairy, Grumpig and other stuff that generally walls Zebstrika. Once these checks / counters to Zeb have been removed, this clears the way for Zeb to clean up. It also works in reverse; Zebstrika can wear down Clefairy, Regice, Roselia and Grumpig by pivoting on them, which puts them in range of Raichu's NP / LO boosted attacks. Adding Floatzel to the mix just makes it easier for these Electrics to break past threats like Piloswine, so I think NP Raichu makes a nice addition to this offensive core. It also adds an electric immunity, giving Floatzel protection from Grass (via Zeb's Sap Sipper) and Electric (via Raichu's Lightning Rod) attacks.
So that you don't weaken yourself trying to gain momentum via entry hazards, you'd probably add a Defogger like Vibrava at this point, and possibly another fast U-turn mon like Jumpluff or CB Ninjask.