I decided to go with another experiment. I figure if people are going to be cheap online, then I'll be cheap online too! See, in Single Battles, you use three Pokémon. You can carry six in your party, which is what you have to choose from (Battle Box is not available in Battle Spot as far as I can tell). So I keep two teams with me: the fun team, and the cheap team. If my opponent's team fails the filter policy I outlined a couple posts ago, I use the cheap team. It's really quite straightforward. 
Drawing from my experiences with Battle Spot trends, I put together a legendary-only team. The exact specs, minus stats, are as follows:
 Xerneas (Heat Rock) - Psychic, Sunny Day, Moonblast, Horn Leech
 Moltres (Power Herb) - Hurricane, Sky Attack, Solar Beam, Heat Wave
 Mewtwo (Mewtwonite X) - Earthquake, Psychic, Ice Beam, Aura Sphere
In practice, this has been very successful. At least, it has against your typical Battle Spot opponent. I've been handily winning matches, and although it's not as entertaining as my usual teams, it is satisfying to know that a smart team beats high base stats any day. And this is a smart team with high base stats. 
The Xerneas works as more of a tank than I expected, although I did pick it in particular to counter Dark, Dragon and Fighting attacks. If I put its IVs through my algorithm, I should be able to make it quite a bit more survivable, as the previous owner only played with it for around 150 effort points or so. Still, it's quite sturdy, and Moonblast does more damage than it has any right to be doing, so I won't complain. I had one person use Thief on Xerneas and steal the Heat Rock. I wish I could have seen the look on their face. It's a sort of a non-sequitur item for Xerneas, but it nonetheless does know Sunny Day. Horn Leech and Psychic were selected for some type diversity; I already had a Fairy attack, after all!
Moltres has a Power Herb, which allows multi-turn moves to execute in one turn. This is good, because Sky Attack and Solar Beam are both multi-turn moves. Though Solar Beam can already be cast in one turn during sunlight, hence Sunny Day over there on Xerneas. Sky Attack has been extraordinarily useful. Heat Wave is the token Fire attack, which beats up Bug and Steel types something handy. Hurricane is a bit of an odd ball, but it came to the rescue a time or two.
Mega Mewtwo X does most of the heavy lifting. Against Dark types, there's Aura Sphere. Against Steel (namely Mega Mawile and Aegislash) and Electric, there's Earthquake. Against Ground, Flying and Dragon (I'm looking at you, pseudo-legendaries), there's Ice Beam. And against Poison and Fighting, there's Psychic. The darn thing's base stats are so high that I tend to one-shot things that for all intents and purposes should be able to survive. This mega-legendary is, as far as I'm concerned, beyond broken.
Still, it's good to have a backup so I don't have to walk away from participants who couldn't put together a real team. I'm still hoping to be able to use the other guys a bit more often, though.
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EDIT:
Aw yeah. Using my cheap-ass team, I managed to land on the best of both worlds. Not only did I whoop a guy who was using an Aegislash, a Greninja with Protean and a Mega Charizard X, but he ragequit'd on the final turn before he could lose. (-:<
Not sure why all he decided to ragequit. What I can say is that when Mega Mewtwo X came out, his Aegislash used Shadow Sneak on it yet left it with 4 HP. The ensuing Earthquake did it in, and a Psychic took out his weakened Mega Charizard X after its encounter with Moltres. Mewtwo fell to a Dark Pulse, so I brought out Xerneas and used the one attack that made the most sense... Horn Leech. I was correct in my prediction that he'd use a Water type move, although Waterfall missed. He had just a few HP left after Horn Leech hit, and it refilled me to max. That's when the ragequit occurred.
So maybe he didn't want to lose to my cheap-ass team. Or maybe he didn't want to lose with his cheap-ass team. Or maybe he was doing a double-take for having gotten nailed by Horn Leech like that. Whatever the reason may be, it's looking like all of them are worth an ornery grin. (-:<
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