Signal beam shouldnt be on any of your pokemon. It gives no important type coverage and isn't that strong anyway.
I totally agree with trachy on dumping Ampharos. Zapdos would be better. its nice to have more than one pokemon with ground resistance, and on an Electric team, you NEED it.
Minun, (I know I'm crazy) could actually be a help your team. Consider this- Zapdos uses Charge, and Minun uses Protect or Light screen. then uses helping hand to give an additional boost to Zapdos' next electric move. Or, Minun sets up Rain dance and lets Zapdos Thunder to its hearts content. With good ev training Minuns defense could let it last a while. I think these two could be good openers. But, then again you said "mono" team, so I'm sure you wouldn't want this, but.... if you do.
Now, Magnezone should NOT have supersonic, as it is extremely innacurate and unreliable. You could just do Lock-on and Zap-cannon, (instead of Thunderbolt) assuring paralysis, thus replacing Thunder-wave for a better move if you can find one. Maybe a bit predictable, but effective, I'd say.
Jolteon's moves are too predictable. If you can find a move to mix it up a little, it might help. The moves are very good though, don't get me wrong, but sometimes you need to surprise the opponent to win.