First things first then, anything I can use for the 8th Gym? Level limit : 30
I'm thinking about training Manectric (vs Team Magma and Aqua) to get a decent offensive Pokemon.
Captain Stand-In? I'm looking at my book and thinking Tropius might be a decent choice, provided you keep it away from Sealeo and just use something else to wreck that Ice-slinging walrus.
1) Grass and gets Razor Leaf, so that's effective against everyone save the Sealeo and Kingdra (which it is normally-effective against thank goodness),
2) Flying, so Earthquake doesn't nail it (and it's 4x strong against the Whiscash to begin with).
3) Whirlwind, so you could actually feasibly force away the Sealeo whenever it comes.
4) It may not be spectacular, but it's not pathetic either. (EDIT: Just looked on Bulbapedia, and it looks like its stats make it more of a tank than anything, so that's something. : / )
5) Easily findable and obtainable.
Also, as you thought Manectric is also a good choice (though once again there is a Pokemon you keep it away from or else get wrecked: that Whiscash and its Earthquake).