Pretty decent Politoed, but I was never a big fan of Focus Blast. You say you're facing a mono-bug team? Why Focus Blast? 1. It has shaky accuracy. 2. Bug types resist it. So see? Replace for Toxic to stall. Otherwise good Politoed :D
Ok, good if you want to set up Rocks and Spikes. I would have EVs in speed, so you can outspeed bugs to at least set up some rocks. But Shell Smash is allowed in Kyron's gym, right? Omastar is a great Pokemon for Shell Smash.
Omastar @ White Herb / Trait: Shell Armor / EVs: 4 HP / 252 SpA / 252 Spe / Timid Nature (+Spe, -Atk)
-Hidden Power [Rock]
Use Swampert to set up Rocks. Replace Hammer Arm, it's not doing any favors. Have Ice Punch instead of Avalanche. Besides that, good Swameprt :D
I think Sheer Force Feraligatr is unreleased..... maybe it's not, i dunno :\
Anyway, great Feraligatr, no changes. Though Jolly Nature might just work. Maybe you could fit Crunch in for Rock Slide? I understand that this is going against Mono-Bug, but..... it's your choice in the end.
C'mon, where's the Rapid Spin? I know that your team isn't weak to rocks at all, but Spikes!?! Toxic Spikes is a danger to your team, I hate poison :\ A lot of of regular Spikes is annoying, too. Replace Psychic for it. Besides, that, pretty good Starmie. nad if you think you can survive one or two hits, Recover might be helpful, but.... it's your choice :D
Agility might be useful, it allows you to hopefully outspeed some foes. 252 HP / 4 SpA 252 Spe if yo're going with agility. Or take Smogon's Agility EV set, which is: 40 HP / 24 Def / 252 SpA / 192 Spe
Hope this helped, and good luck with your battle! :D