So I've been repeatedly attempting the Battle Tower on Emerald for weeks now, and I still can't get to 70 wins. It's really frustrating me. I've created a seemingly perfect team, and still I can't get past 60~ wins. So I'm appealing for some help with my team and strategy. Any tips and criticism would be greatly appreciated.
My team and its basic strategy is as follows:
Slaking @ Choice Band (Adamant)
252 Attack/Speed, 6 HP
The central player of the team, he really doesn't need much introduction. Nine times out of ten Slaking can OHKO the AI's first Pokemon, giving me an instant 3-2 lead. Moves are standard, and I initially ran Body Slam, then Return, before realising the increased power from Double-Edge helps to score KOs on bulky things like Kingdra and Venusaur.
Metagross @ Lum Berry (Adamant)
58 HP, 200 Attack, 252 Speed
Boring, but handy. General idea is to come in after Slaking and KO as much as it can. Usually I just Explode on things, but occasionally it can set up on something that can't hurt it and try to sweep. I find Metagross to be the most expendable member of the team, and often it ends up being sacrificed to set up a switch. Lum Berry blocks random statuses which could shut it down.
Starmie @ Leftovers (Timid)
252 Special Attack/Speed, 6 HP
Again, boring, but Starmie is brilliant. The moves are standard, as is the nature. Leftovers gives it a bit of bulk. Starmie can kill whatever the other two have trouble with, and switches in easily on defensive stuff like Shuckle and Vaporeon.
So far, this team has only had real trouble with legends. I got beaten twice by Curse Regirock, and got outsped by Latios. Double Teamers are tricky too, but I haven't had as much trouble with them as I'd expected. Any general advice on this team? I can't find a fault with it and I'm tearing my hair out trying to get a Gold Symbol from Anabel!